Starmie should definitely stay S, it's such an important poke to be able to deal with and I'd argue people crutch on it at least as much as they do ttar.
Zapdos is incredible. If you're running an offensive team without ttar, chances are you are absolutely throttled by zap and even tar isn't all that safe against those scarily powerful thunderbolts. It has a ton of different sets it can use and those few matchups where it runs into its hard walls can be mitigated by uturn + the smallest bit of team support. Rocks aren't the end of the world. Keep it in S.
I wouldn't be opposed to dropping Rotom-A, as 'wrong' as it might feel at first. It's an amazing poke obviously but some teams can't help but crutch on it a little too much and that gets taken advantage of really easily.
I agree Lucario should be A+ and that it's criminally underprepared for, especially with all the bulkless Gliscor running around. I wouldn't say it is or ever has been inconsistent outside a tour environment at all. Dragonite shouldn't drop though, there are few things more consistently terrifying than him.
Breloom will almost always do something useful, I've never had issues with its consistency. It does so many amazing things in one slot with its typing/ability. Plus, with mach punch you cover some really terrifying guys, ddtar/agili emp/agili luc/lategame scarftran. And a Breloom weakness is one of the worst ones you can have. A+ pls.
Uxie is cool, while it obviously is great against offense it can have some utility against stall with uturn (this will really punish the people who are super anal about immediately spinning with starmie) or trickscarf if you want to go that far, it needs to be wary of ttar but the threat of twave lingers and a pursuit on the switch does't even kill. Plus it beats Machamp and Roserade leads. B is good.
I really like Mesprit, might even be B- material.
I agree about Infernape, Empoleon, Crobat and Forretress.
Not so much about Blissey, gotta respect the threat of how near of an auto-win it is against a lot of these teams that overload on powerful special attackers and don't even bother to have a plan for taking it out of the game.
Same with Weavile, it's a little too high maintenance imo although I agree that in certain games it's extremely frightening.
As much as I'm a Hippowdon guy through and through, I agree with boudouche's points about Swampert. To add on, the fire resist (although this will be trouble if the only other one is a choiced ttar when facing an hp grass tran), water neutrality and especially ice beam for Gliscor are really crucial factors that seperate it from hippo. The lack of recovery is really obnoxious sometimes and prevents it from being the near-auto-win machine that Bliss and Hippo sometimes are but on occasion you'll get some solid roars going against an offensive team that struggles to really dent it and you're in business.
I agree with Loic about lead Raikou. Kou as a whole could probably move up a bit, scarf isn't too great anymore and it's been a while since I last saw subcm, although I don't doubt it could surprise some people. However shuca cm, especially with rash, is extremely powerful. Could make use of funky stuff like charge beam, specs and restalk as well.
edit; I forgot to mention clefable, which owns although I think I like the support sets a bit more. B+ is good