Lore-wise, it makes zero sense that your character is even able to go there. Story-wise, its weird and clunky that you suddenly need to enter this place where the events happened almost 10 years ago in-game. Gameplay-wise, the questing is bland, the graphics in Outland are low poly compared to other parts of the game, and the questing model doesn't fit with the rest of the game anymore (kill 10 enemies in x zone, return to questgiver, head back to x zone to loot items)
Blizzard mentioned some time ago before Warlords the possibility of Outland existing in the Caverns of Time for people wanting to go there for mounts, rep, raids etc. and Northrend would be scaled to levels 60-80. They also entertained the idea of the player being able to choose between Outland or Northrend.
What do YOU think they should do about Outland?