I got my Beta invite today and played a little.
It looks a lot better windowed, and fullscreen is severely buggy (video glitches on loading and then no cursor on the main menu), but then you can't see crap for aiming at distant enemies.
Character models are really crappy. The interface is pretty crappy and and buggy at the moment.
It's kind of fun, but I see no point to play it if you have BC2, particularly the excellent Vietnam.
Maybe if they improve this a bunch after it's been released for a while it will be worth playing, but ehh.