Not really a fan, no. I was rather disappointed in it, for a few reasons.
1) It wasn't like the original Doom games at all, but took the series into a very new direction. This isn't necessarily bad, but after playing the first two games lots as a teen, I had certain expectations on the game even though I knew it would be nothing alike thanks to all the screenshots they showed during the development.
2) While the tech and graphics behind the game were top-notch and impressive for it's time, the actual gameplay just felt like a poor version of http://en.wikipedia.org/wiki/System_Shock_2 (which also happens to be one of my favorite games of all time). The game started nicely to explore the calm non-combat parts and build up the story, but eventually the game design just fell flat, which brings me to the next point.
3) I'm not a fan of the whole scripted monster jumps out of the closet thing, and if the game keeps using it over and over it becomes very predictable, which is boring. Eventually when you walked into an empty room you knew that the moment you reach the center of the room, monsters will pop out. There were nothing surprising or unexpected about it, and the moment of surprise was pretty much gone from the rest of the game and instead it just became a chore. Dead Space have the exact same problem and is also a poor game because of it.
Anyway, as far as I'm concerned, the best thing with Doom 3 is http://www.thedarkmod.com/.