LFG Flexible raid scaling Removal of 40 man(more of a subtraction then addition I guess) Transmogs
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Voice chat...somebody has to say it!
Transmog. Every other feature that was once good was either removed or changed so much it became shit. And let's not talk about features such as Dungeon Finder and LFR...especially LFR.
Dungeon finder.
Transmogrification.
No more time wasted in WoW.. still reading this awesome forum, though