It took me 7 years to "burn out" in EQ, and less than 2 years in WoW.
WoW does have 9 classes,
BUT with 3 speccs each, that gives 27 variants. Most of those are far more specialized than those 16 classes in EQ.
I.E.: a protection Paladin, can't solo for anything, it's a pure tank. A restoration Druid can't solo anything worth the time, but it's a real good healer.
For those high end raids, there are requierements to classes and speccs more stringend than EQ ever was (due to the small raid size). The game is build against the integrated programmable macro system - those who don't do macros will have a hard time to succeed.
And(!) Blizzard has entered the "Way of the Nerf!" like any other game in history, they do braindead decisions that overpower some of the classes or cripple others,then they rush out fixes. They overreact, like Verant did in it's worst days
To worsen things, Blizzard is rabid about their "eSports", they are improving PvP, no matter the negative impact on PvE...
For a level 70, once he did the progression, there is nothing to do in the game besides joining a high end raid guild, or doing PvP, or farming gold with the same 25 quests every day, for some overprized items.
At the moment, not playing any online games. Waiting on a wonder to happen.
Maybe, if(!) SOE gets the new system in for faster AA points, I'll return. Maybe Blizzard will get the clue and do something right about the content - the next expansion won't solve the current shortcomings, only expand them to level 80.
Shaman - the other chain wearing and spell casting melee.