Not good. Not good at all.
* Some of the post-apocalyptic art design is nice to look at.
* Zero gravity ideas were somewhat innovative.
Cons:
* Horrible voice acting makes nothing seem important; particularly the main character who doesn't seem to care that his wife died and his daughter's missing.
* Generic invasion story with silly reasoning and silly villains. I mean, why give the guy an anti-gravity weapon if it can be used against you? Plot holes everywhere.
* Graphics look like 2006 (The beginning of next-gen, barely). Not laughable completely, just barely mediocre.
* A shooter with terrible shooting mechanics (lackluster collision detection, weak weapon impact and kill confirmation, spotty cover system).
* Shaky camera that seems to disagree with you when it's rotated by glitching every 10 degrees.
* Worst of all, the game is boring. Perhaps it's the sum of all these things that make it uninteresting but I genuinely felt I was wasting life by playing it because I was not entertained by any part of it.
My conclusion: Rent it, you'll probably beat it before it's due back anyway, if you can manage to get through the yawnfest of the first few hours, which I didn't.