The game in itself is good: I mean, it's an ID FPS after all. But what gets me is the awesome soundtrack! Back in the days you could just put the game CD in a player and it would explode from the speakers. It's just perfect and gives you the right boost to deal with the Stroggs. The only downside is that is a bit easy: even playing on nightmare it's not that hard comparing to other fps.
The game is awesome. Yes, it's not very re-playable for the story in itself. But the various flabbergasting landscapes, the tremendously immersive music, the sense of loneliness in the world are what still bring me back sometimes just to take a tour in Wyoming's woods. I won't get in the details with the story to avoid spoilers, but I also loved the ending, even if it was really different from what I was expecting. The only downside in my opinion is the price tag: 20 euros for this kind of game is pretty much (I think I bought it while it was in sale). But if you like this kind of game don't let anybody convince you otherwise and just take it.