What have been the biggest nerfs?

[auura]

Surprised it hasn't been mentioned. Mages pet agro was heavily nerfed to avoid mage armies.

The classic mechanic is that if all a mage does is chain cast pets and buff the pet, the mage never generates agro beyond the initial default agro. So, if that mage resummons a pet and sends it on the mob, the pet will immediately take agro from the mage. Well-timed pet back-offs would allow a mage to chain pets to kill mobs that could summon. Mobs that couldn't summon were much more relaxed fights.

Here, mages build agro simply from their pet doing damage, such that each resummoned pet takes longer and longer to pull agro. This is manageable with earth pet until mobs begin to summon.

It just exacerbates mages' utter obsolescence once Kunark launches.