Over simplification. WoW did good and bad things to the genre. Streamlining features would of happened with or without WoW, because MMO's started streamlining things that WoW made popular before it existed. I don't really like WoW much, but I wont pretend it made the genre much worse. It just changed up the formula a bit and that was successful. The types of players that started playing (a lot more than before) are what changed things . Of course if you have tons more people playing you'll have people with different ideals on what is and isn't a good idea in a game.