Hey, and it's an opinion I agree with. Like ghst said earlier, the psychological game you see playing out in Quake is spectacular when you know what's going on.
To me though, you can't really separate that mind-game from the skill element. They play off one another. For example, in Q3A there are players who need to be kept away from certain weapons or they'll steamroll their opposition. I find the fact that their opponent is keeping them away from the weapon entertaining, sure, but I also enjoy watching the techniques which they employ to get the job done.