i got rebuked for my lack of content / kindness, so here I am to give a fuller opinion (off work until Sunday, so i've got the time now as well)
Firstly, I laddered with a team using a Sneasel, and I haven't used Gallade at all. And I have to say that Sneasel didn't feel all that amazing. Okay, it swept at times, but so did Kangaskhan, my other main offensive man. Certainly it swept more often, but Kanga has the amazing double priority on lock to make up for that. Sure, Sneasel -might- (we'll return to this later) make offense feel like it's in a prison shower that stocks extra-slippery soap, but against balance, its performance isn't that great.
This is why I think Gallade is ridiculous; on paper it takes stall to that same naughty shower, and from my experiences it makes balance feel quite violated as well. It's also got versatility in spades - even just the ability to run Scarf means I have to either relinquish my Sneasel momentum or risk losing a mon. (I suppose sneasel could technically do the same, but it never has and I doubt it ever will). Needless to say, there's a lot of posts in this thread complaining that Gallade should have been RU to begin with; as the counter-posts say this isn't a relevant factor, but from my laddering experience it's true as hell.
Let's get back to Sneasel; is it too strong for offense? Well, offense has potential checks, beginning with any water-type + fighting-type as a general core to theoretically take any attack, as well as offensive Mawile and maybe Custap Regirock, as well as Carracosta or even Gurdurr. These Pokemon do hate losing their items, fine, but it's still preferable to dying. Generally offense, especially the kind that can't afford to carry a defensive pivot, relies upon sacrificing mons from time to time, as well as keeping up offensive pressure and making liberal use of Pokemon that can't switch in but aren't forced out either. What i'm saying is, why is Sneasel so much different from other offense-killers? Hell, it's even choice-locked, which as some have said allows Barbaracle to Shell Smash on it-a possibility which scares the hell out of me personally. Ultimately, this does boil down to how good it actually IS versus offense; i was always willing to acknowledge the possibility of it being too good, but i'd like to see it actually perform against it. People not using offense may mean it's bad for other reasons, or that balance is easier to pull off, or any number of things.
other things:
it's true that Sneasel auto-benefits if it can unleash that Knock Off, but it's so frail it has trouble always getting into that position, isn't that strong overall, can't switch moves, sort of unlike Archeops, whose Acrobatics is almost as strong as CB Knock Off (certainly stronger over 2 moves).
I don't like Mega Audino as the holy-grail sneasel stop. Something I think people have been missing out on:
252 Atk Choice Band Sneasel Icicle Crash vs. 252 HP / 252+ Def Audino: 133-157 (32.4 - 38.2%)
so with rocks up, you switch in and basically have a 30% chance to get forced out; since we both know you're going for the Wish, it's a safe roll to go for, since I can just switch on the Protect next turn (or bop you if you're willing to make the ballsy play). Mega Audino + a sturdy Ice resist is nice though. (This all assumes that you won't Mega, which most people won't early-game and which makes you easy to wear down in any case).
kiyo's vid:
replay 1: i've always really liked clamperl
replay 2: in this, we see the man is metaphysically weak to Magmortar and ends up sacrificing his Sneasel stop because of it. As a result, Kiyo won with a 59% sneasel. Is this broken, honestly ? had Metaphysical just cc'd first turn, he would've been much better offf overall.
replay 3: this woman has a corsola. and 3 dark weaks. and he constantly switched despite probably being able to punish you otherwise. ...x-scissor LO sneasel, what is this man supposed to show exactly ? i could've proven that klinklang was broken against this guy too
replay 4: why did he switch out, honestly... i've played this man on ladder and he makes head-scratching plays (the kind where you overpredict and it seems like brilliance, then you stop and 6-0 him). you know, come to think this man is just trolling... ad hominem sez this man is irrelevant. (Also, again i could've proven Klinklang is broken from this replay)
The Goomy:
Honestly, learn to read and learn respect. My post clearly contains the knowledge that what you're saying may be true, and yours contains nothing but disrespect. I suppose I could've stated this all more clearly, but I wasn't looking to write an essay at the time (though i sure am now).
In short... I'm leaning towards not banning Sneasel. However, i'm open to dialogue and I plan to educate myself further on the metagame (no promises but a livetour might be o.k.).
And also, Rain should seriously be looked at, as should SmashPass. Those strategies are consistently good and consistently matchup-based to a really stupid degree.