Yes. It's lack of content. But not in the case of "blizzard have not enough content", but in case "blizzard have not enough content that caters to me as a player". Sure, there is rated PvP, there are challenge mode dungeons, there are pet collections, there are achievements, there are plenty of shit. But i'm not interested in that, i just want the next expansion with artifacts, class halls, leveling all my characters to 110, experience new raids and dungeons, and playing PvP Alien Swarm style - level up, get rewards, drop said levels and rewards, level up again, get rewards back