I installed it and played it for about three hours last night. Nice interface, pretty easy and intuitive.
Basically, it's sorta like EQ2-lite. EQ2 is a level of complexity higher than WoW, particularly the crafting stuff. However, both seem to be very enjoyable, and WoW works better in windowed mode so I can work while I play. :)
WoW reminds me VERY much of Fable, the XBox game. If Fable became a multiplayer game, WoW would be it. The graphics are extremely similar.
EQ2 is very much like Morrowind.