now if they could just fix his weight...
In my opinion, he doesn't really need it. I don't think Mewtwo's weight was the thing that was holding him back. Really, I think lack of compensation was to blame. Mewtwo was clearly designed to be a glass cannon, and, thus, he was made a lightweight fighter. The problem was that he wasn't given enough strong points to compensate for his weight. Like Pichu's self-damage gimmick in Melee, Mewtwo's weight got called out only because it was highly obvious, when, in reality, Mewtwo's supposed "weakness" actually fell in line with his 'glass cannon' design philosophy. Lack of compensation for Mewtwo's weight was the real problem, in my opinion. In any event, with the advent of 1.1.3, Mewtwo's mobility has been dramatically improved, a few moves have become more powerful, some of his hitboxes have been fixed, and his landing lag has been lowered across the board. New combos are already being discovered for Mewtwo, and Abadango is planning to use him at GENESIS 3. Personally, I think Mewtwo is fine as is, and I never thought his weight was to blame for his previous inferiority.
I dislike the momentum removal, but everything else is lovely for Mewtwo.
I can agree with this. I remember someone bringing up the possibility of being able to pressure more effectively with Shadow Ball in midair, but that sort of seemed like a stretch to me. I mean, if you're going to pressure your opponent with Shadow Ball in midair, you're probably not going to be using a fully charged one, so it seems sort of counterintuitive and ineffective to do so. I'm no expert, though. To me, the reduced recoil was a minsicule nerf, in the sense that it slightly reduced Mewtwo's recovery options by eliminating a B-reversed Shadow Ball as a possibility. Still, compared to Mewtwo's slew of buffs in 1.1.3, that one nerf isn't nearly enough to get my spirits down.