Stalker is definitely the best game I played this year, and the scariest game I've played in a decade. Fantastic game. If you've ever found yourself complaining about "stale gaming experiences" or "all FPSes are the same nowadays" you must buy this game. However, this man speaks the truth:
Yes. Absolutely. Please don't come back here saying that I (and others) are wrong to like the game if you haven't installed any mods. If you still don't like the game after installing this, that's fine, it's not for everybody -- it doesn't hold your hand, it's bleak, it's hard, it can be somewhat directionless at times -- but without this mod you haven't really played the full game.