I'll have to disagree with that quote. Doom3 MP is all about the RL and the CG - everything else is next to worthless. The only reason that the gameplay is somewhat speedy is because movement is almost exactly like Quake3 movement - bunny-hopping included.
I didn't like Doom3 because I felt the game didn't offer anything unique - it was a (pretty) rehash of many elements found in the other id software FPS titles. Quake 4 is looking the same way as well, and I'm not psyched about it.
What's CG?
Anyway, I think that the fact that Doom 3 is 'about the RL' (and whatever the cg is) makes it less of a 'hide and ambush' game. If you waste time hiding, someone else is going to get the RL first. This also applies to the soulsphere, berserk, invis, and armor. Hiding and shooting someone in the back as they go by is not going to work on a stacked player.
Also, I wouldn't say everything but the RL is worthless. The SG is the next best thing in terms of power, especially since D3's areas are so small. The plasma gun is good for mopping up weak players fighting amongst themselves. The chaingun is almost unstoppable if you have berserk. Grenades, while weak, are still good for attacking around corners.