What I want:

1. More diversity in dungeon mechanics.

I want to see dungeon mechanics that go beyond: pull group, kill group, once in a while grab a thing. Give me some (non-static) puzzles.

Make me explore the dungeon a bit. Give me s boss room with three entrances, but only one of them is open, let me not know which path to take.

One of my favorite dungeons has a mechanic where you have to lure a giant head onto a platform to kill it. Why does nothing like that show up again?

Give me some different boss mechanics. Give me a boss that explodes into a dozen snakes that have to be lured together onto a plate so they turn back into a whole monster. Or a monster that splits into two each time it is killed.

Don't just make me tank and spank.

2. Give me more roles to play.

I'm tired of just Tank/Healer/DPS give me some new roles.

3. Give me more customization options.

Not every level 73 Paladin should have the *exact* same abilities. Some should be better at tanking, some should do more DPS, I should be able to customize myself more.