Not worth it.
Even by the already low standards of Kingdom Hearts games this game is really just bad in every way. Poor controls, terrible central mechanic, a weak storyline capped by a ludicrous villain and bland heroes. Add onto these things the huge difficulty spike in the late game and you've got a game that's really not worth the 3DS I snapped in half because the aforementioned scheiße central mechanic dropped me out of an incredibly difficult battle when I was moments away from winning.
1/10. This is to Kingdom Hearts what...something really bad is to an otherwise good set of things that it belongs to. It's the Snuff to Kingdom Hearts' Discworld. The Wii to Kingdom Hearts Nintendo consoles. The Florida to Kingdom Hearts' United States.
In closing whoever thought the drop gauge was a good idea should be shot. Repeatedly. And his corpse should be defecated on by Hitler, whom they should clone for the sole purpose of defecating on that guy's corpse.