I played it for the first time recently and thought it was fun. The only things I thought could have been better was you should have been able to reach Bravo team and have maybe a level, or at least half a level, with the squad. An outdoor level with a vehicle would have been nice (after all, Doom 3 more or less was supposed to be a demo of what the engine can do). The AI was pretty stupid and once you became familiar with how they worked, it was easy to kill them. The constant materialize bad guys in back of you and pop baddies from a closet got to be old about halfway through.
Even so, I will play this game again, which I can't say for too many games.