Just finished the demo, and man, was that terrible. The flight controls felt really loose, and the gunplay was some of the worst I have played in a while.
 
The animations for going in and out of cover look like something out of 2003. Maybe it's because I just played Uncharted 2, but fuck, that sucked.

I'll still rent the full version.  I like how the in-flight stuff looks.  But yeah, the on foot portions looked pretty lame in the quick look.

Yeah the flight stuff was surprisingly interesting. A little unpolished though
 
Everything else is janky as hell