: Unfortunately I don't know your metagame, but you asked a question so I'll try to help. If you're asking for changes within a team, personally I like to keep it at a 2 Pokemon change maximum, but I know other Team Raters use 3 as a maximum. Honestly, if your changes are backed up by a good reasoning, then there isn't any reason why you shouldn't make these changes, but you should be trying to retain the same goal of the team. One thing to remember though is that you shouldn't be perfecting the team, just making it function better. If the team is based around a Nidoqueen or whatever, then don't replace Nidoqueen. Find a way to make the team work better while still using Nidoqueen.
As for your query on the quality of your rate, I don't really think there's such thing as a bad rate if you clearly back up your changes. Just be sure to justify your changes, as you don't want to leave the OP of the team wondering why they need to make said change. I'm sorry if this wasn't helpful, but I really know nothing of RU, please keep rating though as your actual content seems very good!
: This was a good team to rate, as it was pretty solid and not many changes had to be made. Despite this, I think your rate was very good and you made solid and valid suggestions to try and make it better. When I was reading through your rate and looking at it against the team, I found myself agreeing with quite a few of your suggestions, so good job on that. I think your Forretress over Ferrothorn suggestion is good as it definitely helps him out against Breloom and Terrakion whereas Ferrothorn doesn't, but if you really want Forretress to be beating either of these I'd recommend running a more Physically Defensive spread, especially since most of the things noted on his threatlist (Scizor, Terrakion, Breloom, Toxicroak) are physical attackers, and you have a much harder time beating these with a Specially Defensive set.
The only thing I felt that was not right with this rate was the Toxic suggestion on Chansey. I think Thunder Wave does better against everything listed on his threatlist. It slows down Terrakion, Breloom, Scizor and Toxicroak who switch in making them much easier to wall, while Chansey can easily switch into Rotom-W and wall it while paralyzing something on the switch. This is much more important given that everything he listed he was weak to would rather take a Toxic than a Thunder Wave, as Toxic takes several turns to start racking up, and all of the aforementioned threats are rarely staying in for more than one or two turns. You also mention that Toxic helps against Celebi, which may be true is some cases where Celebi stays in, but it is likely it wont unless it Leech Seeds, in which case it still heals more than it loses. An alternative fix could've been to make Politoed Specially Defensive to combat Celebi easier, as you can freely spam Perish Song thanks to the SDef investment plus Chesto Berry, while the majority of Celebi are defensive anyway so you take even less from Giga Drain.
Another thing I liked about your rate was your final suggestion. You made this change as a result of your other changes, which is very good as if you make changes to a team, this can often open up some other weaknesses, which you correctly addressed well. Overall, it was a solid rate, but I would recommend that you split up your suggestions into paragraphs. It lets the OP know when something new is being suggested, as well as making it much easier to read rather than a wall of text. Just a preference rather than anything, but I find it's just a lot easier for the OP. Please take these comments on board, good luck rating!
: Alright, I'm going to look over your three rates in a row, to see if I can try to help you out at all. In your first rate, you picked a pretty good team to rate, so it is interesting to see what your suggestions were. I think you did a good job analysing the weakness to CM Jirachi, but your actual suggestion to deal with it wasn't that reliable. CM Jirachi outspeed Gliscor regardless of how much Speed Gliscor is running, and it isn't a reliable answer to CM Jirachi if it is running Water Pulse / Psychic / Flash Cannon or any other common coverage move run on Jirachi. If you identify a weakness, then you should try to fix it, another change could be to try Roar on Heatran, or even make it Specially Defensive. It was good to see that you did identify other problems that Gliscor fixed, such as CB Tar which otherwise causes him some problems.
Moving onto your second rate, I really didn't think this rate was that good. The main thing I saw was that you came across as quite rude, calling his whole team "weak" and saying his actual RMT was "ugly to read". I think if someone said that about my team, I'd completely disregard what you are going to suggest. You are trying to help make their team better, not insult it, just something to remember. For the actual content of the rate, there were also some things I disagreed with. While you may have tried to make his team function better, it seems as if you tried to perfect his team or at least make it better to your liking. You changed half of his team members, completely changing the way he plays. The way you presented it too was annoying to read too, as you don't need to put everything in hide tags, as well as making one line paragraphs. Try to work with what you have, and don't immediately think about replacing 3 or 4 team members when there are changes that can be made without having to replace anything.
Finally, your third rate. This was much better than your second rate, and your suggestions were a lot better. I'd agree that either of Starmie / Mamoswine would work, but I also think that you have to consider what a Pokemon does for the team before you go about replacing it. When you said that Cresselia / Hitmontop are not good for this team, you have to think to yourself "what are these Pokemon doing for the team?", before making such a decision. I'd agree that maybe Hitmontop is not the best Pokemon for this team, but Cresselia is imo. It is his main answer for Dragons, and if he replaces it for Starmie or Mamoswine then he loses a Pokemon every time Salamence or Dragonite switches in. While Starmie / Mamoswine can revenge these Dragons, he still has to sack a Pokemon every time. The support Cresselia provides for this team is too good to give up, as it removes Dragons for Venusaur to sweep.
On your third rate, I also found myself questioning what you've said a couple times, namely the part when you say his team lacks any offensive presence. The team already has offensive Ninetales, Scarf Garchomp and Venusaur, which in itself is already enough in terms of an offensive backbone, especially with the support his team has it's very easy to sweep. Also when you say his core is weak, you really lack any further explanation as to why it is weak, which seems to be a common pattern among your rates. If you want someone to take your changes, please say why as someone will ignore them. But yeah, I think your format could do with a little fine tuning, mainly not throwing every single thing that you think is threatening into a hide tag. You also might want to cut down on making one line paragraphs so often, as it's just choppy and lacks depth. I think your main problem however is that you're coming off blunt and acting as if the OP has done something wrong for making a team with considerable weaknesses. Try to help them without coming off as mean and I can promise you your rates will be much more appreciated.
I didn't look @ Bri's or The Unlucky one's rates, so I'll get round to that at some point.