This is one of the best single player FPS I ever played.
The art style is insanely atmospheric, the cut scenes are awesome, it's not too long or too short and it sure has one of the best looking flamethrowers ever made.
And honestly, I don't understand how some people can say it's a hard game, just lover the difficulty level if it's that hard for you - there's nothing saying that you need to complete games on hardest - all the time.