A terrific FPS.
I concur with many of the reviewers so far: this has been underated, while PDZ was way too overated. This game has the graphics hook and gameplay hook to keep me at it for quite awhile. Playing a FPS with the zero-G innovations in this game is an awesome treat. The weapons are decent and also as innovative as the zero-G. (For awhile I avoided the green alien spider "grenades" as I thought they were enemies until I accidently walked into one and discovered their usefulness!)
The soundtrack is great with many classic songs. A+ there.
I am still battling through this game and have not seen its conclusion yet and I hope I am nowhere near the end yet. This title is really a lot of fun!