Should a Lapsed World of Warcraft Gamer Return to Azeroth?

A reader named Ryan writes: "I've got a question that I hoped could be posed to the readers of Kotaku. I'm curious if World of Warcraft is a series to even bother getting back involved with, after I'd spent some time on it (this is prior to the Lich King and Cataclysm releases/updates/mandatory you-must-buy releases).