Many people grew tired of playing mmorpgs and that's why they think it's a bad game, but these are the same people who get easily bored of SWTOR, RIFT, GW2, etc etc etc as well, so it's not a specific game but rather the genre they're not interested in anymore.
I personally think wow is better now then it was in Vanilla as far as content goes, but the nostalgic feel of a new game, which many people still want, is gone.
Anything is boring if you do it 16 hours a day for 10 years, reduce your game time and you'll quickly realize that you add a lot more years to the game.
Stop playing if you don't like it, I don't play SWTOR because I really hated the fact that either did you fight a massive dude with loads of health or 3 smaller once, no choice, and you're forced to have a companion. I don't go on SWTOR forums and tell them I don't like the game.