This is a game that promised a lot and delivered a little. However it is still a fantastic game that is worth collecting as the community created content brings us the game we had all hoped for.
The graphics are fantastic although you will need a fairly high end system to really appreciate them. The gameplay is non-linear for the most part meaning you can tackle an objective any way you desire. Several different ends to the story give the game some replayability.
Check out the official forums to find mods that will change the way game is played and deliver a much more enjoyable experience in the zone.