I am quite an experienced Summoner while I main a Black Mage. It is sort of true though, the summoner is doing quite a bit less damage than a BLM. It should never to more than Black Mage just because it has Raise and good Virus and other utility. BLM isn't awful at utility though, but having Raise as a DPS class is just ... Still I agree that Summoner should do a bit more damage. Not a lot though.