The downsides can be summed up into one word.

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TIDUS.

Just kidding ^~. I wish that the world map had been more accessible and flexible through the game. It was pretty linear, but I did still love the game.

Having only one character being able to summon was a limitation at first... but I learned to get over that and still love it!

I can't say I found many downfalls to this game... it was pretty awesome.