been playing since the beta in 2004, and it
doesn't have to take over your life like so many say.
What kind of game player are you? Do you like to cast spells and stuff? Do you like to get right in there and 'fight' to the death with a variety of weapons? Do you want to have pets fight for you and shoot with a bow/gun, etc? Do you want to heal others? You also have to pick, Alliance or Horde? Good or bad?
There are quite a range of characters and they're all good for one reason or another, so it's hard to make a suggestion without knowing your playing style.