i enjoyed the demo enough that i am considering picking up the game.
i did have problems with the camera... i'd prefer to have it pulled back more, or a button (not a stick click) to center it. the force grip was a bit frustrating, i had a hard time aiming objects i wanted to throw (but i liked all the things i could force push/pull).
as for the button timing part... i wish there was more time devoted to the cinematic portions. it felt like it was over way to fast. in God of War, you hit a button, then Kratos does some crazy move that spans a couple of seconds. it seemed like this, had a second between button presses, so you didnt really see what you were doing until it was over.