Getting rid of "Up" jump would help a lot when trying to do up attacks, so you don't have to worry about accidentally jumping. The only problem I had because I used X to jump was that I sucked at the No Specials Gameplay mode in Melee (You could only use the control stick and like A).
Yeah, I had that whole problem with hitting up while trying to do up tilts. Luckily, they've added a feature to remove being able to jump with the control stick, so I should be much more efficient with my attacks.
Hey I got a question: Has anyone played against CPUs? If they have, how much more intelligent would you say they've become versus difficulty 9 on Melee? Are there any retarded glitches such as Fox's movement loop on the lower part of the Hyrule Temple, Captain Falcon's down air-smash A jumping move versus an opponent on a high platform, Luigi's inability to simply do his Up+B recovery instead of F/Smash+B "Green Missile" attack, or Marth's constant Midair+A suicide loop? I hope my question is clear and I didn't confuse anyone in the process.
And I believe I'm pwned on the 3rd-party issue. :P
From what I've heard, the CPU AI isn't much better than it was in Melee. Maybe they don't do those same glitches you mentioned, but I wouldn't be surprised if we end up finding new glitches. Hopefully they can recover properly now.