Indeed, I agree that the levels in Doom II are far better than those in Doom. But Doom is a legend
By the way, I found the levels in the official expansions to Doom II - Plutonia Experiment and TNT even better than those in Doom II - Hell on Earth, as in these expansions the levels stretch the limits of Doom II engine to get out the best. Some levels in TNT were in my opinion even so great that even any in Quake don't match them, counting the right music piece for the right level in.