Divinity 2 was a fun one as well. It had a very old school feel to it which I enjoyed. But it didn't feel like a single player WoW like the OP was suggesting. Still though, I really liked and was surprised with how much fun I had with it.
$60 on Steam, $40-50 from various online vendors. There's also a free demo on Steam.
Gotta say, I tried out the demo for Kingdoms of Amalur based on recommendations in this thread, and was instantly hooked. It's like they took all the cool stuff from WoW, Skyrim, and DnD and put it into this game. Definitely worth at least checking out.
A physical PC copy was for sale on Amazon for around $15 today, only a few copies left. I am pretty sure my wife is buying Kingdoms of Amalur for my birthday, so I will have to hold out. I have read nothing but good things about the game, especially about the combat system.