So unlike a few, I actually enjoy the new summoner. It doesn't feel dumbed down, and the rotation is a lot more fun. Now I actually use all my summons, and the summons themselves feel more like traditional Final Fantasy rather than say a World of Warcraft Hunter.
That being said, one thing I would like to see is a change to Gemshine and Precious Brilliance. As it stands right now I run out of keys going through my rotations, and thus I had to make a Macro that throws Gemshine over Ruin and Precious Brilliance over Outburst/Tridisaster. As we all know, macros have input lag bad and i tend to accidentally cast the underpowered versions instead of X Ruin/X Outburst. I feel the flow would go so much better if Gemshine and Precious Brilliance were just things that REPLACE Ruin/Outburst instead of being separate spells.
That is literally my only complaint. Well, sorta. I would cut off my left foot to get a Ramuh-Egi or Shiva-Egi buuuut LOL