This game is much better than the Gamespot review.

User Rating: 8.4 | Quake 4 X360
Quake 4 is a great game. The single player experience was great, and a little scary (not nearly like Doom 3 though). The game is action packed and the story actually kept me involved. Also, i loved the NPC interaction.
My only beef with the Single player is that there are 3 vehicles in the game, and you only use each one once, for one full level each. I think it would have been a better game without them, they seem like they were forced in there.
The multiplayer is great as well, it plays just like Quake 3 Arena, so it is almost like two different games. Again, no vehicles in the multiplayer though.
Like Gamespot says, it does have its graphical glitches, but it is not nearly as troublesome as they make it sound. It also looks as good as the best of them on 360. There is one small level later in the game where it gets real choppy and thats the only time the slowdown Gamespot spoke of bothered me at all.
Anyway, If you're a Quake fan, definitely buy this game, I know I was hesitant at first after reading the Gamespot review, but I'm glad I bought it for sure. If your not a Quake fan, It is absolutely worth a rent.

P.S. Its also a neat bonus to get Quake 2!