www.letsexaggerateproblems.com
Summoner is generally fine but they have got hit really hard with two things:
1) Poor gear optimisation (Either they need their own gearset, or pet needs to scale off spellspeed)
2) Resource issues
Fix those, and you'll have a strong dps class that doesn't take much of a hit of dps from movement like BLM, doesn't have positional's like Monk/dragoon and is ranged (unlike ninja). They also have raise, and they have fantastic sustained AOE with 4 targets if you can bane (which, honestly, is few and far between in Final coil).