Definitely. for the huge mega multileveled dungeon with the 13 levels, I agree that dungeon should be hardcore and have some real challenge too it. Maybe a couple entrances few exits. Some monster respawns like patrols and such. Go all out and make that almost a raid dungeon and companions are encouraged to be recruited to help you clear it. Stock up on pots and such. Real challenge yields real rewards with recipes, items and rare spawns.
For the normal dungeons I agree with others, some empty, some choked with monsters and mobs. But give dungeons different dynamics.
Diablo II and III all had the same mechanic. Monsters, one entrance, one exit, and one rare monster per dungeon.
Eternity needs all kinds of dungeons to explore to add depth and curiosity. If i know that its full of monsters every time and I dont need XP i wont go in.