Natural Selection 2

Has anyone played this? I normally dont play any single video game very long but I have been playing this for 1-2 years or since it came out. Its a game on Steam that is currently only a few dollars through the humble bundle where you pay whatever you like. Its worth checking out since its a very complex game where marines are pitted against aliens.

http://www.naturalselection2.com/

http://www.rockpapershotgun.com/201...otgun/steam+(Rock,+Paper,+Shotgun:+Steam+RSS)