I got the XBox version, and thought it was a sub-par FPS, the control system was ok, but the levels just seemed really really square and unfleshed to me, much like if a 12-year old made them. I paid $5, and it was only worth about half that....
I'll admit that I was looking forward to getting it, but once I started playing, I just found it tedious, and it now sits on my self with the hundreds of other unplayed/unfinished games.