Ok, I'm going to start trying to help out here as much as possible :)
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Eranu: In your first rate you overcomplicated things, he needed Stealth Rock and a more reliable way to shut down Deo-D. This can be accomplished by adding in Forretress, with this change he can now set-up Stealth Rocks, keep up the momentum with Volt Switch, and spin away the hazards Deo-D lays down. Obviously, Forretress can be spinblocked by Gengar, a common sight on HO teams, but with just 152 SDef EVs (it's probably better just to go all out Specially Defensive, but I thought I might as well point out how little you actually need); Gengar fails to 2HKO Forretress, them Forretress can 2HKO Gengar with Gyro Ball in return. This isn't as reliable of a fix as Xatu would be, but it's a smaller fix that somewhat mitigates the problem, but it's better than having to change 2 members and a set just to fix the same problem a little bit more reliably. You didn't point out that his Heatran had max Special Defense and HP... but with a Timid nature, lol.
In your 2nd rate you suggested Dugtrio, without Focus Sash, it's going to be finding it incredibly difficult to get up Stealth Rocks and trap what it needs to trap in the same match. As the owner of the RMT pointed out, Mamoswine is also his best Mamoswine check, and while it's true that the Foretress you suggested can take over that role, I will expain why Forretress dosen't fit on his team as well as Tentacruel does. Tentacruel is important because it's by far his most reliable water resist, but that's not a problem because he has 2 other water resists right? Wrong, Abomasnow is his weather inducer, he really can't afford to lose the weather war. Abomasnow also has no bulk investment, it dosen't like being burnt, Politoed sometimes carries Focus Blast, Keldeo completely wrecks it, etc. Similiar reasons apply to Kyurem, it's destroyed by Keldeo, it's the main sweeper so he dosen't want to lose it, it has minimal bulk investment, it dosen't want to be burned, etc. Overall, neither of them can switch in on water types and offensive water types will become way too much of a threat, so keeping Tentacruel is Tentacrucial :) Also, when you suggested Forretress over Tentacruel because of a Choice Scarf Terrakion weakness, you didn't explain how Forretress would actually mitigate his Terrakion problem, even when it's obvious, it's very important to do so.
Overall, your rates need some work. But if you focus on trying to look for the smallest change possible (such as set changes, EV spread changes, only changing one pokemon, even item changes) to fix problems. As well as looking at the new holes you've opened up by making a change to their team, and explaining how the changes you've suggested will help fix the problems you've noticed, I think you will be a great team rater some day :)
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dragonuser: Honestly, dragonuser your rates are already pretty great. As an accomplished tourney player and frequent poster in the Overused forum; your metagame knowledge, experience and battling skill is superb, so the ability to rate teams comes to you naturally. In your 5th rate you suggested to change his Latias set, the team's creator stated that his current Latias was a great check to Venusaur (huge threat to his team.) And although the Latias you suggested included Thunder Wave - which would prevent Venusaur from sweeping - you slashed Reflect as an option. If the team's creator had chosen Reflect, then Venusaur would get up a few Growths, beat Latias 1v1, then sweep your team. Next time you should probably stop and consider what new holes you open up when making a change, and either don't suggest the change, or suggest another change that would patch up the hole created by the previous change (if you have to do alot of this for one change, then your suggestion may not be the best option.) Overall, your rates are already pretty amazing, you probably just need to work on spending a bit more time thinking about the changes you suggest, if you do this successfully; you'll be a great team rater in no time :)
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Neliel Tu Oderschvank: The team you were rating was pretty bad, so it was a difficult one to rate. The biggest problem with your rates is that you really don't explain exactly why they should make a change, you often say things like "try Life Orb so you can do more damage with Ice Shard", which isn't a valid reason to make a change, Choice Band allows you to do more damage with Ice Shard as well. I understand that Choice Band dosen't make much sense with Stealth Rock, and the ability to switch up moves is very beneficial to Mamoswine, but you didn't mention anything like that, you just stated it does more damage. Elaborating is very important for convinvcing the team creator to make a change, you need to write down viable reasons and longer evaluations. Using damage calculators to help back up your claims help alot as well, you suggested a CM Latias to counter Venusaur, and you claimed Latias can switch-in on Chlorophyll users, when in reality, Psyshock from that Latias isn't even that likely to 2HKO Venuaur. Another problem with your rate is that you suggested 3 major set changes and 4 smaller ones. When rating teams we're trying to help improve their team, make it more effecient, not turn it into a completely new team. I under stand that it's difficult to resist doing this when the team your rating is not very good, but maybe avoid rating teams of those who lack any competitve knowledge.
Overall, you probably need to work on quality over quantity. If you do so, you'll have better rates in no time. I'm sorry if I sounded harsh or mean, but hopefully my advice helped :)
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Ganj4lf: Your rate is overall really good, you provided damage calcs, lenglthly explanations, and good reasoning. The only problem I see is that you didn't mention a few things that really should be changed. Golurk shouldn't have a Focus Sash, he dosen't have a spinner to get rid of entry hazards to preserve its sash, he dosen't have weather of his own to get rid of Hail to preserve its sash, and his Golurk has max HP, so it's unlikely he's going to be OHKOd. I would have suggested Flamethower and Ice Beam on Genesect, an unboosted Choice Band max Attack neutral nature Flame Charge is weaker than unboosted no attack investment neutral nature Flamethower on Genesect, Return dosen't provide much either, he'd have to switch to a Defense decreasing nature, and he wouldn't get the speed boost (I can't imagine when being locked into a non-STAB base 50 power move at +1 speed is going to be able to threaten any decent team), but he'd have much better coverage with Flamethower and Ice Beam. Being able to go mixed is one of CB Genesect's biggest niches over CB Scizor, it makes it much more difficult to wall, and it can actually be helpful when it gets a Special Attack boost. I also noticed that his entire team is swept by Venusaur once Heatran is trapped by Dugtrio, and although he can attempt to sweep with SF Lando before he gets swept by Venusaur, he's still too weak to standard sun. I would have looked for something to mitigate his Venusaur weakness. Your rates are rather good Ganj4lf, keep them coming :)
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Gimmick: Your rate is pretty good. Usually changing the main member of a team is not something that you're supposed to do when rating. But the team wasn't actually built around Flygon, Flygon was added in later on, it's not very good in this meta, and Volcarona is probably too much of a threat to not change to Landorus. The reasoning behind Leftovers over Iron Ball and Night Shade over Trick on Sableye, and Life Orb over Choice Specs on Latios was very good. Overall, there's nothing really wrong with your rate, except for it being very similiar to the one dragonuser posted, lol. Keep up the good rates :)