This game probably sets a new standard inn what a Lineal game is, most of the game is basically just walking forwards non stop with a few sidestep to pick up goodies and such.
The really Bads :
*No optional dungeons, or places where you have to pick your brains a little. Basically not much thinking in this game.
*Focus, falcie, focus, falcie, focus, lcie, lcie, focus, lcie, focus focus. That's all what the conversation is about, you never really get to feel attached to any of the characters and their EMO trips are way overplayed and darn old by todays standards. It's very hard to get emotionally attached to a bunch of emo teenagers who rage trips the whole time and has the retard behavior they have.
*Gran Pulse : Yeah, finally you get somewhere else than Coccoon, but hell, it's more of the same walking over and over again, and honestly you don't really get to hear something interesting about what happened on Gran Pulse that left the world so devastated and lifeless humanoid wise. Just tidbits from Vanille and Fang , nothing really to explain how the people rebelled against cocoon etc.
*Combat system : To be the part thats supposedly shines, it's darn slow and repetitive in unlocking new abilities or options to fight with. Jumping through paradigms wears off quite fast and its basically just a shift of roles to either heal, buff or debuff your enemies linked togheter with damage and chain increasing combos. Basically you want to do the most damage the fastest way possible to your enemy and theres not much strategy there really.
Either way you are basically mostly using autocombat for 95% of the fights anyway.