Its only $4.99 used at Gamestop, so I picked it up recently.
Although I haven't played all through it yet, it seems like a solid sci-fi style FPS. The only major gripe I have so far is that the melee attack is defaulted to the L3 "clicker" which is very uncomfortable for me. But it seems you can remap the buttons, unless I am mistaken.
I definitely think its worth getting, or at least trying out, especially at that price.