Everything in this post has probably already been said more eloquently already but here's my two cents:
Sneasel
Amazing power and very much was an underrated threat until more recently. I'm not sure if its usage has gone up due to the bans of toad and typhlosion or people just started to notice how great it is. Sneasel can employ a choice band or a life orb allowing it to hit a lot of the tier with devastating effect. It has access to great priority in the form of ice shard allowing it to cripple or OHKO common faster threats depending on the item.
252 Atk Life Orb Sneasel Ice Shard vs. 0 HP / 0 Def Archeops: 198-234 (68 - 80.4%) -- 37.5% chance to OHKO after Stealth Rock
252 Atk Life Orb Sneasel Ice Shard vs. 0 HP / 4 Def Lilligant: 174-205 (61.9 - 72.9%) -- guaranteed 2HKO after Stealth Rock - after qd speed boost
Like Weavile, Sneasel has a great STAB boosted knock off and pursuit allowing it to trap the tiers Psychic types and provide a reasonable check to the Lake Guardian duo. Also worth mentioning is SD set which I personally find to be the most threatening.
All this said, I am against banning Sneasel. Sneasel is the quintessential glass cannon and NU is not a frail tier with a shortage of tanks that can withstand/resist its attacks. Grandbull, gurdurr, garbodor, quagsire, hariyama, poliwrath, weezing and throh all either hard-wall Sneasel or can OHKO after taking hits/resisting STAB's. Sneasel is most often used as an all-out-attacker either becoming choice locked or taking damage from LO, in addition to taking 25% from every switch-in on SR, meaning that it gets worn down relatively easily. Sneasel doesn't really switch in on anything either, I don't think I need elaborate but most STAB/non-resisted moves will just OHKO. It's primary role is as an offensive lead
Sneasel provides a decent balance to the tier but is far from gamebreaking. Enough common walls in the tier can switch in and handle Sneasel consistently and either one shot it or force it out. This is why I am for no ban.
Gallade
I was a little surprised when Gallade fell from RU back in May, especially with garbage like Hitmonchan still in the tier, that said I don't really play enough RU to provide any deep insight into this, I imagine it was just outclassed by Medicham and/or wasn't quite strong enough to break the walls in the tier (most of the tier). Gallade boasts a great and far deeper movepool than Sneasel with close combat, drain punch, knock off, shadow sneak, swords dance, fire punch, psycho cut, zen headbutt, stone edge, earthquake,bulk up, ice punch, memento and plenty more. Unlike Sneasel it's a little harder to guess the item that gallade may be carrying although thus far I've seen choice scarf, lefties, lum, assault vest and life orb variants. Gallade has a base attack stat of 125 making it the (tied) third strongest physical attacker in the used tier, behind Archeops and Rhydon. Unlike Sneasel, Gallade has some notable defensive stats. 115 base special defense means you can switch in relatively comfortably on quite a lot of special attackers, barring scald users, and outspeed them. 65 base defense and 68 HP are pretty weak but Gallade can hardly be seen as a glass cannon.
With the aforementioned coverage moves I find that Gallade is a very difficult Pokemon to switch into since none of the walls that can easily wall out Sneasel can the do the same for Gallade with the exception of Granbull. Things like Mush, Xatu and Claydol can absorb Gallades STAB attacks but can do little against it offensively and will not enjoy knock offs or boosted shadow sneaks. I've seen a few defensive colbur berry Xatu's on the ladder specially to take knock offs and weakened Gallade with t-wave or air slash although this can hardly be described as a counter. The SD + Shadow Sneak set is very capable of sweeping weakened/unprepared teams, as I've come to appreciate already this suspect. With access to psycho cut things like garbodor cannot be used for chip damage with rocky helmet and Gallade can cut through the rest of your team quite easily.
252 Atk Gallade Psycho Cut vs. 252 HP / 160+ Def Garbodor: 200-236 (54.9 - 64.8%) -- guaranteed 2HKO
252 Atk Gallade Zen Headbutt vs. 248 HP / 232+ Def Granbull: 112-133 (29.2 - 34.7%) -- 100% chance to 4HKO after Leftovers recovery - the only notable wall that can switch in on a swords dance variant and force it out.
252 Atk Gallade Knock Off (97.5 BP) vs. 252 HP / 252+ Def Colbur Berry Xatu: 93-110 (27.8 - 32.9%) -- guaranteed 4HKO - not a hard check since gallade either switches out or may have boosted priority shadow sneak. Although 252/252 Xatu is kinda trash for anything else.
Gallade is a Pokemon that is very difficult to play against and this is why I am pro ban. A variety of sets have the ability to beat entire teams and is perhaps just a bit too strong for the NU tier.
Sneasel
Amazing power and very much was an underrated threat until more recently. I'm not sure if its usage has gone up due to the bans of toad and typhlosion or people just started to notice how great it is. Sneasel can employ a choice band or a life orb allowing it to hit a lot of the tier with devastating effect. It has access to great priority in the form of ice shard allowing it to cripple or OHKO common faster threats depending on the item.
252 Atk Life Orb Sneasel Ice Shard vs. 0 HP / 0 Def Archeops: 198-234 (68 - 80.4%) -- 37.5% chance to OHKO after Stealth Rock
252 Atk Life Orb Sneasel Ice Shard vs. 0 HP / 4 Def Lilligant: 174-205 (61.9 - 72.9%) -- guaranteed 2HKO after Stealth Rock - after qd speed boost
Like Weavile, Sneasel has a great STAB boosted knock off and pursuit allowing it to trap the tiers Psychic types and provide a reasonable check to the Lake Guardian duo. Also worth mentioning is SD set which I personally find to be the most threatening.
All this said, I am against banning Sneasel. Sneasel is the quintessential glass cannon and NU is not a frail tier with a shortage of tanks that can withstand/resist its attacks. Grandbull, gurdurr, garbodor, quagsire, hariyama, poliwrath, weezing and throh all either hard-wall Sneasel or can OHKO after taking hits/resisting STAB's. Sneasel is most often used as an all-out-attacker either becoming choice locked or taking damage from LO, in addition to taking 25% from every switch-in on SR, meaning that it gets worn down relatively easily. Sneasel doesn't really switch in on anything either, I don't think I need elaborate but most STAB/non-resisted moves will just OHKO. It's primary role is as an offensive lead
Sneasel provides a decent balance to the tier but is far from gamebreaking. Enough common walls in the tier can switch in and handle Sneasel consistently and either one shot it or force it out. This is why I am for no ban.
Gallade
I was a little surprised when Gallade fell from RU back in May, especially with garbage like Hitmonchan still in the tier, that said I don't really play enough RU to provide any deep insight into this, I imagine it was just outclassed by Medicham and/or wasn't quite strong enough to break the walls in the tier (most of the tier). Gallade boasts a great and far deeper movepool than Sneasel with close combat, drain punch, knock off, shadow sneak, swords dance, fire punch, psycho cut, zen headbutt, stone edge, earthquake,bulk up, ice punch, memento and plenty more. Unlike Sneasel it's a little harder to guess the item that gallade may be carrying although thus far I've seen choice scarf, lefties, lum, assault vest and life orb variants. Gallade has a base attack stat of 125 making it the (tied) third strongest physical attacker in the used tier, behind Archeops and Rhydon. Unlike Sneasel, Gallade has some notable defensive stats. 115 base special defense means you can switch in relatively comfortably on quite a lot of special attackers, barring scald users, and outspeed them. 65 base defense and 68 HP are pretty weak but Gallade can hardly be seen as a glass cannon.
With the aforementioned coverage moves I find that Gallade is a very difficult Pokemon to switch into since none of the walls that can easily wall out Sneasel can the do the same for Gallade with the exception of Granbull. Things like Mush, Xatu and Claydol can absorb Gallades STAB attacks but can do little against it offensively and will not enjoy knock offs or boosted shadow sneaks. I've seen a few defensive colbur berry Xatu's on the ladder specially to take knock offs and weakened Gallade with t-wave or air slash although this can hardly be described as a counter. The SD + Shadow Sneak set is very capable of sweeping weakened/unprepared teams, as I've come to appreciate already this suspect. With access to psycho cut things like garbodor cannot be used for chip damage with rocky helmet and Gallade can cut through the rest of your team quite easily.
252 Atk Gallade Psycho Cut vs. 252 HP / 160+ Def Garbodor: 200-236 (54.9 - 64.8%) -- guaranteed 2HKO
252 Atk Gallade Zen Headbutt vs. 248 HP / 232+ Def Granbull: 112-133 (29.2 - 34.7%) -- 100% chance to 4HKO after Leftovers recovery - the only notable wall that can switch in on a swords dance variant and force it out.
252 Atk Gallade Knock Off (97.5 BP) vs. 252 HP / 252+ Def Colbur Berry Xatu: 93-110 (27.8 - 32.9%) -- guaranteed 4HKO - not a hard check since gallade either switches out or may have boosted priority shadow sneak. Although 252/252 Xatu is kinda trash for anything else.
Gallade is a Pokemon that is very difficult to play against and this is why I am pro ban. A variety of sets have the ability to beat entire teams and is perhaps just a bit too strong for the NU tier.