Looking at my parses from tonight on -REDACTED- Mind you, pets are all pretty much dead on this fight really early, and won't be coming back (OH MAN MASSIVE STRAT LEAKS)
DPS
Temellin + rakatheel, 171k damage
Nwaij + Pets, 152k
Sstilki 148k damage
Teijin 145k Damage
Nifera 144k Damage
Sintasia + Pets 141k damage
Caer 114k
Manguadi-bot 110k
Sintasia did ~11k less damage than nwaij, and his pet lived 96 seconds, doing 12k damage. The fight lasted another 480 seconds, without the pet. Had it actually lived, and continued its dps of 133 he'd have done 204k damage. had temellins pet done the same, it'd have done an additional 21k damage at 44 dps. Putting him at 192k.
On another fight in the same zone earlier in the night that requires a lot of movement (I Probably missed a lot of caster dps on this fight)
Nifera 166k
Nwaij 165k
Sintasia + 159k
Temellin + 150k
Sstilki 140k
Caer 134k
Teijin 124k
Marchie 120k
Once again, sintasia is near the top, beating out better geared toons. The accuracy of this parse is a little bit flaky but still.
As long as the pet stays alive, AND they can rain, their dps is fine. The problem is keeping the pet alive is hard without your healer having to step in, and far to often raining isn't really possible (Cc'd mobs, close quarters, etc)
Really, the mage needs to be able to keep his pet alive without anything past any group heals the rest of the group is getting. I'd also say it's probably acceptable for a dps loss when things have to be cc'd; there aren't that many mobs that need cc'd on raid fights, and usually you can manuver to avoid it. However, the close quarters raining all over yourself craps all over mage dps and impacts them on far too many fights.