For defence AOE hitters are better than snipers, as the AI targeting algorithm, even improved recently, is still not very good.
But are you sure you want to put 2 greens in def team? Maybe replace Quenell with someone blue? Dispeller if you have one, so the attacker cannot take down your team by using heavy riposte heroes?
The only potential problem I can see is that neither Hathor nor CKad are dealing any damage (to speak of) so the center is highly annoying, but not very dangerous. The overheal is definitely a big plus, but when I use healer tanks I like to surround them with as much firepower as possible.
But if that is what your roster has got it´s definitely not a bad defense.