I've played the demo a little bit more, and this time on the PS3 which makes no difference whatsoever, but it will be the version I will be getting to play online with a local friend.
I'm still not happy with how close the camera is to muscle man, and he still walks at a slow snail pace. Yeah I know I can run, but nevertheless...
The first time I played I didn't know that I could change between weapons automatically without opening the items grid, and I'm glad I discovered this feature accidentally.
In single player I try to always be at a close distance to Sheva, so as to have enough time for either of us help each other. She actually came to be quite useful at certain points, surprisingly.
I got used to the "knife" I guess, but don't think it has much use.
I got my head cut off by chainsaw guy but head was not seen rolling out, or at least there was no apparent gore whatsoever (even my friend that was watching me play went "what the hell???"), so I'm guessing the demo is censored, and hopefully the actual game is not censored.
I wish I could customize my own button layout.
I think that this game was definitely made to be played co-op, and I think that single player won't be as fun.