I miss it's twisting paths, and watching groups getting lost, I never got lost there ( I got lost almost everywhere else, how does one get lost in the Deadmines ? ....) I would gently tell the group what direction to go and they would ignore me and wander aimlessly in circles. The evil part of me was amused as I would sit down and watch them come past me( I would start a campfire and cook usually) over and over asking if they were ready to follow me yet. in a way it felt like what i imagined a dungeon would, mysterious and dangerous, you had to carefully explore (ok it was never that hard , yes some pulls got messy but that's the fun of it) You could imagine camping there stopping for a meal after securing an area. ( yes, respawns , I know,but I'm imagining here). The event at the end , if anyone else stayed that long was neat too. I like stuff like that . You should be able to trigger a special boss everywhere, it added something. People are in too much of a hurry now .
I like Blackrock Depths too , I get lost there (actually I don't anymore) and they need some railings, but it's fun and has that going into a real adventure feel to it.