I personally tend to agree with those that prefer handcrafted dungeons. Handcrafted dungeons can be created to make sense in a way that randomized ones never will. I'm an old school tabletop RPG player, and I've seen a few "Randomized Dungeon" products, and they never compare to decent dungeons that have actually been planned out. Now it's true that I seriously doubt that Legends of Grimrock will be able to stand up to something like Rappan Athuk, but I'd like it to make more narrative sense than, say, Dungeon Hack.
A good discussion of drawing dungeons can be found on
http://story-games.com/forums/comments. ... onID=12181. Yeah, it's focused on tabletop RPGs, but the same concepts can apply to computer dungeon crawls.