It's a fine enough game, but it used to be the greatest game. Revelation: Back in WoW's top-dog days, you played the game and did not raid and enjoyed it. A lot. Some of you didn't even make it to max level... and you enjoyed it. A LOT. I played all through Vanilla and hit level cap only 5 days before TBC came out... and still, I loved the game.
I dare you to go make a new character in WoW, get to about level 10 or so, and pull 2-4 packs. Don't kill the mobs, just stand there. How long does it take them to kill you? How long would it take you to kill them? Is leveling a "grind" or an adventure?
...exactly.
Now I dare you to try the same thing in ESO, Final Fantasy, GW2, etc. You'll die in about 10 seconds. Killing 2-4 packs at once requires serious concentration and optimal use of abilities... if you can do it at all. Much of the time you'll have to run away. You HAVE to think, build your character, and play him/her well or you die.
WoW is just... a shadow of what it was. The entire game is raiding and daily quests. 90% of it is now irrelevant and boring, especially if you have heirloom gear. Nothing in the game is threatening at all. I remember in Vanilla I would walk into a new area cautiously, scouting out the mobs. Oh - and by the way - praying that a Horde Orc Rogue wouldn't pop out and destroy me at the wrong moment. There was an invigorating sense of danger, risk, and interest.
TLDR: The game is too fking easy.