Its fun, but there are a few draw backs
Good:
Perfect length, it didn't overstay its welcome
Guns are awesome
Level designs are cool, especially the grave yard
Voice acting is good
Graphics are good with a few exceptions
Interesting choose-your-path mechanic
Bad:
Some of the graphics are bland: when I got close up to a skeleton looking things I could see colored squares that make up the skeleton
Could have made a couple more weapons
Vehicle missions aren't that fun
Not enough character development
A sex scene seems out of place
Daylight missions are a pain
In conclusion the game is a good, solid, and fun fps with cool weapons and story, but a few issues bring the game down from what would have been an excellent game. A sequel is highly recommended from me, so lets pray there is one.