If we go ahead and ignore the stat squish, which is something that comes down to personal taste since its just numbers:
- We lose Tiersets. While they tended to lock down slots in armor, they are still more interesting than "stamina crit and hast" on a slot.
- We lose legendaries which where a nice way to customize classes. Especially in mythic+ you find yourself often switching between them for different situations. The method of acquiring these obviously sucked, but the idea itself was really really good. They do implement a few as talents, but thats it.
- Artifact weapons are gone, and with them a million passives (remember, WoD had passives as well while you leveled up). This time around, there won't be any passives from leveling, and there wont be any passives from artifact weapons.
- We trade in 20+ passives that completely changed how a class worked or had nice small effects for THREE effects from our Azerite "tierset".
- We lose effects such as execute for Assa Rogues, Full Moon for owls, fall damage immunity for rogues, purgatory-lite for Fury warriors, sprint on leap for arms warriors, Ebonbolt for mages, the list goes on forever. One wonders how an elemental shaman will ever be able to do DPS without his legendary boots and gloves.
- Visual diversity will be gone. With no more artifact weapons, their transmogs are gone (old ones stay, obviously.) and with the removal of tiersets, i fear that every mail, leather, plate and cloth wearer will look the same, akin to Trial of Crusader tiersets.
- Many classes class identity will suffer greatly from this. They feel incomplete and i HIGHLY doubt that 3 traits can change that.
- No level 120 talents, no "new" talents, no active effect from the azerite neck itself, no new spells for any class, nothing.