... can we admit that Tier 11 (WoW 4.0) was actually pretty damn awesome and one of the best states the game has ever been in?
Raid: Proper difficulty from easy to very hard, LOTS of content and different scenarios, nice fight mechanics and design.
Some bugs, but oh well every raid had that.
Maybe not as good as Ulduar or Karazhan, but probably Top 5 since release for me.
(Heroic) Dungeon: The right middle ground between BC nightmare and WotlK faceroll heroics for me.
Nearly all addition (other than Archaeology) added improved the game: Reforge, Guild leveling, Old Zone Revamp and Talent Tree Revamp (for Leveling) and while this might not be a popular opinion here 10/25 man instances.
Pretty disappointed in what came afterwards though other than Transmog and Ragnaros.