Does nothing new, but does it good.
The game feels like a cinematic experience, there are very few cutscenes and most of the important stuff happens ingame.
The Strogg have kick-ass new models and look pretty menacing, although there are a few bad ones.
Level design is pretty good, considering that you spend most of your time indoors.
The game does some neat things with the Doom 3 Engine, like if a rocket or grenade explodes near you, the screen blurs and you won't be able to hear much.
Most of the new weapon models don't look too good, although there are some exceptions.
The vehicle parts of the game are boring and are not needed.
The Bottom Line
A great action game, you won't see anything new in this game, but what it does is good.