A few minor improvements and this would be a great FPS...As a bargin bin game it's OK.
On the good side there's: Graphics are well done and run smoothly' Controls are good - mostly standard FPS. Audio is well done. Storyline keeps you guessing who's the bad guy. Longer the many FPS games on the market..
On the bad side Too difficult - You die too often. Your weapons are weak compared to the enemies. Minor bugs here and there - eg: sometimes just jumping on top of a box can be a problem. Ending is weak - dumb - stupid - take your pick.
Conclusion If you like old-fashioned style shooters and your patient through the difficult parts (or use a cheat) you'll likely enjoy this game as long as you get it at a cheap cheap cheap.......price.