Very Gory, Occupying And Fun
The story is, you play as a character called Marcus going round different locations shooting monsters trying to drop of an explosive electronic cartographer until you realize that the cartographer didn't scan the whole underground infested caverns so instead you get a big bomb and blow out the entire underground system manually with some help. There are a selection of challenging monsters, primarily the berserker's. There is also a large arsenal of powerful weapons at your disposal most of the way through the game, especially the Torque Bow.
It is a great game in a simple context.