Once, during the beta before it even launched, because I was bored. Even then it was well done and polished, but it was kind of uninspiring, considering I used to run a MUD back in the day and was used to being able to write new code and add new features whenever I thought of something interesting while playing. That, and they didn't really do anything new that we (or dozens of other MUDs) hadn't already done or thought of before, aside from having pretty pictures.
I know, I know, Blizzard's job for the past decade and a half has pretty much been to take other people's ideas and polish the hell out of them, and they're good at that, but I probably won't be satisfied with any MMO until it does something completely new that I've never even thought of or that I dismissed as impossible, while also managing to be fun at the same time. I've considered that I may be a bit picky or have unrealistic expectations. Heh.
