I don't believe in quitting games that are good, even if they dumb down much of the game, it still takes effort and the right sort of mind to play certain aspects of the game more fully. I prefer PvP and exploration, leveling my crafts and socialize with my guild mates. As someone else has said, ALL MMO games will have some sort of grinding involved at some point. It just depends if that game forces you to grind to progress or not and whether you can choose to do it or choose something else. In WoW, you have many choices and that's a big thing for me.
Many other MMO games don't have much choice. That's why I've stuck with WoW on and off since February 2005. It's a game I will never quit. It's a game I will take breaks on but that's about it. So until Blizzard decides to call it quits or sells it off to some third rate gaming company and screws it up, I will go back to it at some point along the way.
I have played many MMO games since the mid 1990's. Yes you read that right. Since the 1990's. MMO games I played and quit permanently were Dungeons & Dragons Online, Lord of the Rings, Aion, Maple Story and about two dozen others. WoW isn't one of them.