Doom 3 was every bit what i expected.
To the people who say its too dark. Its doom, what did you expect? Its not half life, its not counterstrike, its not far cry or wolfenstein or battlefield. Its doom, is the same story, the same plot, the same setting. Its supposed to be dark and scary.
It is the undisputed champion of OGL engines and likely will be until carmacks next generation in ~2008 if not later. To consider it completely irrelevant because you didnt like the gameplay is just childish.
The engine is obviously made for the future with support for enough textures for 512MB cards, multithreading, very advanced physics effects, amazing lighting and shadows, all of which im sure are just a grazing of what the engine is capable of (compare Quake 3 to the latest CoD on the same engine).
There is only one thing i have to say about HL2... LOADING...
People who have actually played the game will know what im talking about. Fanbois that say "OMG HL2 OWNZ" just because its faster on ATi in some charts theyve seen on the internet wont know. (by the way, the game plays great at max settings on a 6600GT @ 1280x1024 with no AA and 2x AF the same for Doom 3 on "high" quality)
I actually delayed getting Doom 3 for fears of wasting my money and picked it up recently cheap at sams'. Im sorry i didnt buy the game sooner, it is great and im thoroughly looking forward to completing the game and getting the expansion.