Check out some of the boosting threads. Reading them has almost made me switch from 5x sham to 1 70 pally + 4shams. It is no doubt mindless and will leave you not knowing how to play the characters, but I have manually leveled 5 70s already and the xp rate of the 5x shaman team is sorta leading me to believe it might take me a LONG time to get them to 70 without boosting them.