The only thing I didn't like about the gameplay was the walking, it felt a bit unintuitive and I find that changing direction can be a pain in the ass. I hope I get use to it if I play longer.
I would have liked a more traditional directional walk compounded with something similar to the 'heavy' feel you get when you aim a weapon in Killzone. (IE: it takes longer for inputs to register outscreen and the movement must first gain momentum, making the onscreen motion more natural and less twitchy).
Right now I move like a drunkard in some scene, trying desperately to walk in a straight line only to see myself twitching left then right then left again.