We need dungeons with end bosses like Duriel, which drop uber uniques, in the form as at the beginning (with a value that could roll), and give glyph experience. There was a similar principle in D2 and everyone loved it and farmed endlessly.
It also eliminates the annoying collecting of materials, the group advantage with Duriel and the problem with duplicating materials.
Furthermore, we need the possibility to save our builds together with the Paragon Board.