I enjoyed it quite a bit, but then again I wasn't expecting anything more than it was. HL2 and FEAR on the other hand... People raved about great visuals and storyline, and they were just pathetic.
HL2 had better character models, but the environments were hardly impressive. The storyline was dull. The characters that were supposed to be part of the story just kind of showed up here and there, and I had no attachment to them at all. I mean, were you supposed to actually care about that woman (can't even remember her name) that gets caught in the explosion at the end? The AI was pathetic and I just gave up on trying to keep NPC's alive. Speaking of contrived, why does everyone think G-Man (is that right?) is actually a worthwhile addition to the story? He is simply thrown in to try to add some kind of mystery to the game, but in reality serves no purpose whatsoever.
As for FEAR, the storyline was ok, but the environments were absolutely terrible. Talk about "lather, rinse, repeat". There were, what, two different types of environments (and mostly offices)? The creepy cutscenes were neat, but few and far between. The demo pretty much contains everything anyone needs to see in that game.
Doom III was not a masterpiece of storytelling or gameplay, but I don't think anyone really thought it was going to be (I know I didn't). It had great visuals (it wasn't hard to adjust the gamma and add the duct-tape mod), and provided a few hours of pointless monster killing, which is precisely what I was expecting.