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[The Niles]

I know that this will be controversial but I like Doom3 more then I do HL2. I have not finished either game so this is not a full opinion but Doom3 is more honest in my opinion. HL2 tries to hard not to be a FPS and I don't like that. The level design in HL2 is not good either. Too easy to get lost and not know what you are supposed to do or where you are supposed to go.
Graphically Doom3 is also a lot better then HL2. Doom3 is the next generation graphics engine HL2 is the pinacle of the current generation graphics engine. Although I will admit the water effects in HL2 are second to none.