I actually enjoy SMN.

[Mnemosynia]

Anyone who maxed out and got good with SMN in 3.x

I'll explain.
You did not experience the no cd shadowflare that made our aoe great.
You did not experience the use of sustain on titan-egi while leveling and doing fates making your life easier.
You did not experience bane being able to spread your dots basically everywhere.
You did not experience contagion being way more responsive when you use it.
You did not experience ruin 3 before ruination and it being used out of dreadwyrm when you become good at managing mana.
You did not experience using Bio 1 2 and 3 then using bane.
You did not experience using miasma 2 in pvp or in pve.
You did not experience titan-egi actually being used for something.
You did not experience the power of being the only class that could res people outside of healers. (although this is a selfish one)

There are many things and nuiances about summoner you just do not know, I am not blaming you and you maybe a good player but you cannot understand how to older players feel unless you actually played it.