After getting Aibrean leveled enough to be useful, I have mixed feelings about him.
He’s fun to fly, and I love tweaking through new Hunter skill/spell combos and strategies with “difficult” drags like Hauheset. That said, he has his limitations, and so far seems in no way the equal of drags like Necryx and Noctua and Neptus and Estril, no matter how skilled the flyer.
And I know people like to sneer at the suggestion of white spells, but his lack of a mage-disabling spell is really what makes him fall shy of drags like Noctua and Necryx, whose white spells really make all the difference. I would question the sincerity of anyone who claims they’d opt for him on a solo war hit over Necryx or Noctua or Neptus.
Also, I personally find the cooldown on Flash and Renewal annoying, making him more vulnerable than hunters with Cloak and/or Healing Mark at critical times during battle.
That said, he is a fun addition to the hunter-lover’s arsenal, with perhaps his most useful application being a setup dragon (like many hunters), with the excellent ability to drop handy rage/heal marks behind for secondary attackers; although Chaos (especially with mythic runes left over from Tengu) also makes him a decent closer for taking out lvl 60 farms and mills — an area where many hunters fall short — particularly since he can generate his own rage (as long as he has enough for at least one Renewal cast beforehand) which allows for repeated castings (although here’s where the cooldown is irksome again…). So he does have some diversity working for him.
Not the best hunter out there, but far from the worst.