Find a server with friends or acquaintances. It's amazing how boring the game becomes when none of your friends play anymore.

I started playing as Horde in Classic and raided through AQ40 with old high school friends. They all quit a few months before BC and I rerolled alliance to play with college friends. Both factions have their jerks, both have immature kids, both have amazingly wonderful people. If none of your real life friends are active wow players, you can always roll horde on Magtheridon and join the Zerg ;).