As someone who has beaten it's Critical Mode, I have to say it's by far one of the best KH games, more specifically, best of the handheld ones next to Birth By Sleep. The command deck system is much nicer and less clunky then the Classic system from KH1 and 2, and not as frustrating as the card system of CoM. Personally recommend it without a doubt.
However that's not to say there aren't downsides. I haven't played it in ages, but I recall some bosses were just ridiculously powerful, simple because they can constantly stunlock you until you die. And every now and then I had a hard time getting the freeflow movement to cooperate with me lol. But it's a great game none-the-less