As far as it goes, generally speaking, ranged attack power for hunters is a big deal, therefore when you say you have like 2250 ap and that is good, you are right. We are sure there are hunters with more ap, no offense, but dmg for mages warlocks tends to be on the lower side of the spectrum. So like +1100 fire damage (Archlord gold) is pretty decent for a mage, but there is better.
We do not know of any mages with add 2250 fire damage or better, even if the mage is decked out in full T6 epics with fillers from end game (Archlord online gold) raids. They will not have that much dmg. healing for priests is a little different. You can tell when you look at priest specific items. If a good mage item has like add 200 spell damage, the priest equivalent has like add 300 or more. Healing power is always way more than spell damage in Archlord. That's what we have seen so far.