1) Put in all the trout that was cut. Most notably Kislev.

2) Cut Pupu from the game entirely. Seriously, smurf that thing.

3) Give the church some actual pressence. The fact the church existed as a cover for Solaris amounted to nothing, as littlerally it get's fragged not just after your first visit, but by Solaris. As it is there was no real point to it.

4) For god sakes give us more info on some of Fei's past lives. As it stands, we get barely a glimpse into any lives other then Fei or Lacan, and it's not nearly enough to care or matter to the plot. Had you saw nothing about Fei making the Nano machines, and it was never brought up he had anything to do with it, nothing would have changed. If you are going to have it there, make me give a damn.

5) Make your magic useful. The entire game is nothing but hitting the same combo in a fight over and over. The exception is the haste spell, which is cast just so you can do that same combo more rapidly. Even Legend of Legaia got more use out of it's spells then this game.

6) Gear fights are pretty much the same as a normal fight, only longer because of fuel and having to build up to do the combo. Make the Gear fights feel significantly different from regular fights, or make them the same. Don't do this bare minimum change that does nothing more then make the fights last longer.

7) Rebalance the characters. Citan is way to damn strong compared to everyone else. When he gained the ability to haste himself I though, "You know, hit his group spell target first, then haste the party, it would be so powerful!" and my next thought, "Wait, why waste the turn? Citan is the only one that needs hasted anyway." This is a pretty damn accurate description.

8) When Final Fantasy X, no contest, beats you out for more unique monster designs, you have a problem.

9) Give some smurfing life to these dungeons. Not even the platforming, just the dungeons themselves are so badly done. They are extremely linear, and in more then one instance so many rooms just look the same in a dungeon. Twice this causes problems with navigation, the big one being that last smurfing dungeon.

I'd mention disk 2 plot dumps, but fix a few of my above issues and those would go away entirely.