Hello, my favorite KH entry (for now).
I loved it when I first played it, and I still loved it when I played it again in 2018.
Sure, the camera has its PSP limitations, but the command deck is just great. Spells and skills that don't rely on MP but instead a cooldown timer that's not too long means you're finally able to just go all out instead of going "oh but what if i need my MP for a curaga in 3 seconds". The style changes depending on which skills you use are also great, really overall it's just a joy to play, IMO even moreso than KH2.
Story-wise it's also my favorite, which considering my prejudice against prequels is honestly astonishing.
Having to go through the same worlds three times may sound tedious but it's really not, thanks to the events being different for each character and the worlds also just being pretty short.
One thing that never bothered me (because of the power of overleveling and great command setups) but I can see why it bothers other people, some of the bosses in this game. They can be brutal and kind of cheap.
My favorite segment, same as Fynn, Blank Points. It's not as flashy as other secret endings, but damn is it good, and that scene with Dearly Beloved playing as you see all the characters waiting for Sora gets me every damn time.