I will not go on and on about how fun and addictive WoW is... others have done that. I just have two comments:
1) At least for Mac users, don't believe the 2 GiG ram recommendation. Have at least 8. I played with 4 gigs for several years and the memory was always paging to the hard drive - which makes the play jerky (not good in the middle of a fight!!!). BTW, I upgraded to 32 Gigs (overkill i know) for only $163 dollars.
2) Whoever at Blizzard wrote the NPC audio to try to give it an Asian flare has never been to Asia. All the Pandarians will tell you to "SLOW DOWN... Life.. should be savored" HA - I have lived in Asia for over 25 years, and no one slows down over here... Anyway, I find it an annoying part of the game, but I'll get over it. :)