And as for me... I kinda loved the idea of shoving God into a tiny red and white, (or perhaps gold, black and white, purple and white, it's all up to you) ball and stomping the ever-loving crap out of whatever inferior being that was put out to fight you in exchange.
Of course, I'm also incredibly partial to summoning spirits of the world Tales style. Sheena Fujibayashi in particular. Was always fun to get Maxwell to smash the opposing enemy party with GIANT METEORS... Good times, good times.
Persona 3 main character bullet to the side of the head.
But why summon a monster when you can "summon" your own personal alternate reality, reality marble anyone?