The key issues for me with summoner are as follows:
Lack of Single Target and AoE pets (Boss and trash mobs).
Lack of burst damage for boss encounters like Tam Tara HM corpse grooms (just needed another 300 potency to add to the mix).
Remove stuns and silence from pets. Those who remember Ifrit HM and Chimera back in the day knows exactly what I mean here.
Give Titan a provoke so he could be a true emergency tank.

Does 3.0 fix any of these issue for me? Maybe one and that's a big maybe.