I like FFX's system best. For the most part, the aeons weren't overly powerful (until you got the optional ones, of course.), and you could control them. The monsters at the monster arena can make quick work of them, that's for sure. But, the aeons are good enough to help you out in a pinch or for trying to get some Overkills.

FFVI's got to be irritating. One summon per battle, and they weren't exactly the most useful things. Yeah, they taught you stuff, but...eh.

OOC:FFVIII indeed doesn't require mass amounts of drawing, nor does it require summoning. I can get through the game just fine with no more than a total of two hours collecting magic and never summoning a GF into battle; shoot, if I wanted, I could probably get through the game with nothing more than physical attacks and good junctions.