nobody but the tank should pull, period. apart from the fact that  a mage ends up as mashed potato when he has bad luck pulling a group, the tank loses aggro. precious time is wasted thus, because the tank first has to run around and get the aggro back, before the full group can go spank the mobs.

As a druid I will ask mages to sheep pull so it stays out of range of swipe, but I will actually pull half a second before they do with faerie fire (feral) so I get the initial aggro instead of them.