Finally got a chance to play the demo. I enjoyed it. Really liked the UI/HUD. I'm enjoying the game, but it seems like a strange instanced version of an MMO raid done as an FPS. People will ninja your loot. You'll apply damage and shield buffs.
It could really benefit from a dynamic AI director a la Left 4 Dead, because as it stands, it gets very repetitive -- the same enemies and mini bosses will be waiting in the exact same spot as last time. Unless doing a mission on a harder difficulty opens up more areas or a different scenario/arrangement on that map?
Excited for the full game, none the less.