I played in though most all expansions, and quiet after cataylism. For a originality format of it, its changed so much, it makes noobs get gear fast and it takes little effort according to friends who still play. I basically have 3 accounts all inactive and no plans on activating, after playing for 3 odd years off and on, they changed, the basis of the classes which was like tradition and added to the game.
World of Warcraft is EXTREMELY fun. There's tons of stuff to do. The graphics are cool. The player vs player combat is awesome. BUT- be warned. It can be addictive. I played for 5 years. I averaged about 25 hours a week. And I know plenty of people who played it ALOT more than me. Try it. It's a blast. But remember it's just a game.