WoW's good for what it is. It took a long time to get there though, and there are times when it's possibly the least enjoyable game on the roster, but that comes with the genre. And for that it's a blessing and a curse at the same time - it's the ultimate hit, the must have title in MMORPGs, and yet this game is solely to blame for the fact that the genre became stagnant and unable to evolve over the past years. Every single developer that dares stepping into MMORPGs seems to try to either copy WoW and make a few quick $$$, or tries so hard not to be WoW that they lose all sight of a clear direction.
God of all games? Not in the classic sense. But if we accept that gods may be many and fallible then WoW might be among them. It just wouldn't be the best example of a god.