"Why does no one complain about Summoners?"
Seems you're speaking in comparison to Bard.
The clear cut difference is utility, namely Silence. If Bard did not have Silence, it would not get invited so heavily. Then we'd have people only complaining about Bard as much as people complain about Smn, which is as you've noticed, never.
Idk, when running AK over these months as Pld, I've noticed mobs melting much much faster with a well geared Smn over a well geared Bard.
Obviously this is also not proof, just personal experience, and that's all we can offer at this point.
