The controller felt totally fine when I got my hands on it a few times at PAX Prime. It's super light, which is a little offputting, and the touch screen is kind of shitty, but the controller itself feels fine.
@Captain_Felafel: What GPU are you using and what is your average framerate between high and medium?
GTX 580. On Medium, with everything else maxed, I get average of 55-60, unless there's heavy fighting, in which case the framerate can drop to the mid 40's sometimes. On High, that average framerate drops by about 5-8 frames.
I'm also having about significant frame drop during combat. I just figured it was because, hey, combat, stuff is blowing up everywhere. The game normally sings at 60FPS, but in combat, that'll drop down to around 43-48FPS at any given time. I've got a GTX 580, and even though it is a brand new game, I can't believe it's that demanding.