Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Classic, brilliant game

This is definitely the best of its kind that I've played. Half-life wasn't really revolutionary - it was just a top, top quality game. It has got everything - huge attention to detail, great graphics, great storyline, realism, atmosphere, excellent A.I., great multiplayer (see Counter-Strike), great challenge. My only reservations are that it loses its way slightly when you enter the alien world. Once completed, the one-player version is still great fun, although maybe it doesn't have the playability of say, Unreal Tournament.