Just finished the demo, and its painfully short. Plays sorta like a softcore rainbow 6 and halo put together. Has online Co-op though, so i know i'm definitly going to be picking it up. Looks awesome during gameplay.
The game was actually not bad. I was thinking it would suck hard. There are frame rate issues and some other little things. But this game could be exciting. Watch the video on gametrailers of the boss battle out in the mountains. Its a huge ass hydra shit, you fight it from a chopper. The video was sick.
The demo has been up for a couple weeks, actually. I played it awhile back and liked it. I'm not sure I'd pay $60 for it, but I'll definitely buy it when it drops into that $30 range.