Great use of the Doom 3 engine, and the game keeps a fast paced action type game play through out.
The multiplayer is basically the same as in Quake III Arena. Which is not a bad thing but you can tell the style of play is a little out dated. The game does not make use of the dynamic lighting that Doom 3 made so famous, (you no when you point the flash light on something it casts a shadow or a light casts one on you) unless set to ultra quality where as Doom 3 it was set on all quality levels. It does take away some of the abeyance of the game and sheer WOW factor as you play through the game without the lighting. Which is why you need to play this game on ultra quality to really get the most out of it.
If you like FPS's and have a monster PC or are willing to upgrade, then you should definitely pick this title up.