But with incredible contents you can better than Wow . İ have very spesific idea for game contents , you have ever see in any game. 

Little Example: Skill for a witch or unholy priest: Death throes , when enemy get this effect for 5 sec all coming healing change do damage for him. Did you see skill like this before ?

You can use this skill for some dungeon mechanics. In my mind all class  will always need for some dungeon.  So there will be no meta and any tierlist for classes.  Cuz all time one class will be need for some dungeon . 

Contact with me if you interest for more