The main issue I have with Summoner is the fact that the Ifrit-Egi is worthless, Garuda does the same thing as Ifrit but is ranged, has contagion, and doesn't stun. If your soloing and worried about taking damage you will use the Titan-egi who also has a stun. Ifrit also has his Thorns/Damage reflection ability that never does anything because he never has threat.

Honestly I'd be happy if they would just re-work the Ifrit-egi, make each egi have a specific role like...
Garuda can be the "Ranged single target dps Egi" which it pretty much is.
Titan can be the "Tank egi" which it is.

Ifrit can be the "AoE Egi" change his stun attack to not stun but and AoE DoT instead, change his worthless thorns shield into another AoE/Gap closer(Ifrit charge anybody?) maybe even make his basic attack cleave? more or less just have Ifrit-egi be a giant AoE damage ball, no CC, no worthless buffs. this would at least give him some situations were he is useful.