While dungeon bosses have been good, the trash is still trash. They need to change up their formula for the trash between bosses, because just bulldozing through random groups of enemies no matter how big the group is is getting stale. They've made some interesting trash pulls in like alliance raids, and variant, and criterion dungeons, so I would like to see some of those design philosophies carry over to regular dungeons. I think forcing players to change up their tactics a will lead to more memorable dungeons, but not like how Origenics was handled.
Another thing that will make dungeons better is dyable gear. Just please stop with the undyable dungeon gear.