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I've played just about every MMO there is and there's one thing that Wow does pretty much better than all of them: It works WELL.
Yep - that's it. I can be in a pvp battle with 80 players and maintain a playable FPS throughout. Blizzard created a fantastic game engine that not only performs well - it does so on just about everyone's computer.
After the HUGE disappointment that is SWTOR - with their 15 FPS Warzones - the 7 year old Wow just plainly kicks it's ass. I'm not talking just about content (which you would expect a 7 year old game to have) but the game engine. What was Biofail thinking when they launched with that horrendous steaming pile?
So - Wow will continue to dominate for just that reason.
Currently playing SWTOR and it's MUCH better than it was at launch.