Summoner could of been so much cooler...
When I heard you could be a summoner, I thought you would be able to summon Ifrit how hes portrayed in boss fights (not as big, but I feel he could be as big as the Iron Giant enemies). I thought you would be able to control him like he was your character with unique skills and such. What we got was this lame "pet" system. How un-gratifying is it to summon Titan only to have him be a floating pebble? Completely de-values the name "Summoner".
I would switch to a summoner instantly if you could summon a Primal (their real model, not the pet one), take it over and play as the Primal with a unique hotbar of skills.
Really a shame how it was handled.