Very like Doom 3, some nice features included. Much like Quake 2 including bland textures and repetitive game play.
The sounds add a lot to the game and nice features like vehicles and finally a flash light on a weapon (only the one) give some nice touches and stops some of the boredom.
The game play is also very repetitive, with continually shooting of monsters, not massive amounts of story line and very limited puzzle solving. Although this is what a lot of FPS's are.
This game is one of those where its up to you if you want to play it or not, I would not go out my way to play it.
Once again GL Quake is still the original and the best of the quake series to play.