Not to threadjack, but this is an ignorant statement. There is nothing dumbed down about WoW. Removing unnecessary tedium and jacking up the fun in MMORPGs isn't dumbing down. Tedium != difficulty. Letting people solo forever isn't dumbing down - it's just different. The difficulty level of WoW is no different than any other good MMORPG. The big difference with WoW compared to some other MMORPGs is that you have a lot more choice. If you want to coast, solo, and never be truly challenged - you can. If you want to group, do instances, do raids, do hard and long quest chains - you can. But you're never forced into anything. It's not dumbing down - it's incredible game design - and the choices and flexibility increase the fun factor manyfold. WoW has 8 mil subs because it's fun, not because it's dumbed down. Gamers aren't morons looking for dumb games to play.
Ignorant? I played almost every MMORPG worth playing since Meridian. Which included Ultima Online, Asherons Call 1 & 2, Everquest 1&2, Earth and Beyond, Lineage 1&2, Eve, Mourning, FF XII, City of Heroies/Villains just to name few. And the reason I say WoW is dumbed down is because the game is easy. Reaching high levels is just a matter of running the level treadmill. Go from zone a for levels XX-XX, zone b for level YY-YY, do instance A when you are level B and so on.
The magic system is simplistic, so is the fighting system in general. The quests are a chore without any real need to use your brain. The PvP is artifical and boring, etc etc.
And thats the reason the game is such a success. The masses of gamers want it easy and dumbed down simplistic systems. They dont want to use their brains when they play, which is understandable in a way since it is entertainment after all. However the first MMORPGs were definetely not like that and I personally think it's sad that the current MMORPGs are so simplistic and easy.