TBH, Phoenix is still going to be at least A+ tier in my mind. All the nerf truly did was separate the chaff from the wheat; the chaff being the derpy "shot-->teleport" players that we all know and love and the wheat being the REAL Phoenix players that make her do work. She's still going to be a pain in the ass either or cause' that's just how her character is, but players are going to have to think, if only a little, lest they drop like a rock (literally). On the bright side though, Phoenix did get a buff, although it is a universal buff: Air X-Factor. This is going to help her a HELL of a lot more than any other character.
Of the old cast, I find it funny how Wesker is still going to be a beast. I seriously think the nerfs did jack shit to him. -100,000 health? That aint nothing. Less float on Samurai Edge? Hurts a little. Just means you can't get a free combo from a derp shot anymore. Then, look at his buffs. 15% damage and 10% speed increase as he gets his ass kicked (I think that was the number)? Boss. Cobra Strike cancel into teleport? Awesome. Increase startup and damage on Jaguar Kick? Excellent. Gives me a reason to use it cause' it's comboable now, allows Wesker to break 500k damage on his own (he had trouble without lvl 3 and assists previously, and this is not accounting the damage boost from broken glasses in this one) and makes his combos look even more flashy. The good seriously outweighs the bad here. I swear, Capcom is in love with Wesker or something XD (not that i'm complaining since I am too)