As a bear tank I have found that it's easy to stealth into the area where the slaves are in steamvaults and kill them one at a time solo. There are 16 slaves and slavemasters that it is possible to pull one at a time and get 12 rep each, so each stealth solo run gets you almost 200 rep. It would take a long time to get to exalted this way, but it filled in a few hundred rep while looking for a group for a full run.