The absolute worse thing about MoP isn't the dailies grind or the introduction pandas it was whatever crack they smoked coming up with that god awful "new" talent system. It genuinely sucked out any kind of progression you felt while lvling up and it honestly made me loathe lvling up my character because it felt like fuck all mattered because you either picked the talent that was actually useful or didn't and were called a retard for not following the most hand holding mechanic in the game. You can argue that every talent system was ultimately the same because you eventually followed the meta but atleast the old and even retail talents made it feel like your choices matter while your character grew.