Its been a 4yr wait for Doom3. But I can say the wait is well worth it.
Doom3 is simply breathtaking. First starting with how scary it is. It is scary in every sense of the word, its up there with games like Resident Evil and Silent Hill.
The Graphics engine though aged a few years now is breathtaking. The lighting system is revolutionary it really pushes the limits of lighting to a level we've never seen before. It is amazing how well the light interacts with every object in the game. The lighting is very key in making the game creepy.
The Physics are amazing as well the world is somewhat interactive but the way everything iteracts with eachother is well done.
Overall even with some slight flaws because of its 4yr age it still brought some new ideas to the table in how to make games esspcially with its lighting and sound work.