I finally got to play the demo at a friends house and.. i'm unimpressed to be honest. The controls feel super clunky, since the only version of RE4 i ever played was the definitive version (Wii, duh). Hell when i tried playing RE4:WE with the Classic Controller it didn't feel as clunky as it did on the 360's pad.
Other than the number of enemies, there's not much there that makes this feel different from RE4. The graphics weren't even that great, and this was my first extensve experience with the 360 on a huge HDtv but to be fair, my friend probably didn't have all the right cabales or whatever. Point is, the whole time i was thinking "this could be done on wii and at least feel better control wise".
I don't know how i feel about co-op, because my friend was so bad at the game it barely mattered that he was there. He helped me out a few times, like shoot an enemy i couldn't see behind me or i'd steal some of his ammo, but thats about it. If i have to save my AI partner as much as i did him in the main game, i'd probably never want to finish it. Hell we barely had the desire to finish the demo after he got his head chopped off 5 times in a row.