They started messing up when they decided to help unskilled players to compete in the endgame. Doing so actually degraded very much the endgame scene, which (as has already been said in this thread) was the main feature of WoW: skilled players got frustrated that the endgame was getting ruined and quit. Now, if skilled players quit, it doesn't matter how much you give free loot to unskilled players: if they have nobody to mentor them, they will fail. And they will complain. Hence, Blizzard dumbed down even more the endgame, making everything even worse...
It's just that, everything else is at most a corollary.
This is pretty much why noob friendly may never mean noob entitle-y.
Players can both enjoy a game AND have complaints about it. I'd bet that you could even find a correlation with complaints to "success" ratio.
If MPEx is anything to go by the key to domination goes through finding all the idiots and stepping on all their toes while making a vocal point of it, pointing and laughing and peeing in their mochaccino.
A game be released, yet not be ready for final judgment. This is a work in progress, and likely will be released as one as well.
Since the Internet it's rare that anything actually ever gets "finished" anyway. Actually, in the case of artwork this had been happening for centuries. Masters repainted their work over decades.