Got around to trying the demo:
Runs like shit. 20FPS on "Gamer" when Crysis 1 ran at around 30 on mostly High (some medium) options.
You die really fast, armor or no. Too fast to swing around and respond to somebody shooting you if you can't see them before they open fire.
Felt like there was mouse smoothing going on, because the low FPS made my mouse noticeably laggy.
Was there an extra map in the PC demo? The server I joined was cycling between the rooftop and "Pier 17". Pier 17 sucked, btw. Didn't like it at all. Rooftop was a way better map, though still confusing. Lots of cases where I was frustrated trying to get around obstacles to get to my objective, especially whenever I went inside that office area.
I felt less like a superman and more like a robot man. Like I was playing as robocop. In that Pier 17 map whenever I could hear fighting going on on a different floor than me on the building everyone was unless they were a sniper (in which case they camped across the pier in that building that was as far as I could see completely inaccessible without exposing yourself to the snipers or slowly working from spot to spot in cloak), I sighed and didn't even bother trying to go join it, because the slow, clumsy movement and fast deaths meant that unless people are fighting five feet next to me, I'm not going to be able to join that fight.
Just in general the maps felt too big for the player count. We had 9/10 guys and Pier 17 in particular felt big and empty. Even on the rooftops I never saw more than three people in a firefight at the same time, even around the dropship king of the hill thing.
The LMG was way overpowered compared to everything else. My K/D ratio doubled when I "unlocked" the Gunner.
I'm just gonna go back to Bad Company 2 now....