Kingdom Hearts:
I found that this one was pretty boring until the last few worlds, but those last few worlds were good. The room before the final boss and the final boss itself sucked though.

Kingdom Hearts Re:Chain of Memories:
words can't describe how much i loathe this steaming pile of garbage. save your sanity, watch the cutscenes instead of playing it.

Kingdom Hearts 358/2 Days:
one of the better stories in the series, gameplay is probably the best that could be pulled off on the DS.

Kingdom Hearts II:
My second favorite in the series. Easily the best playing game (god bless drive forms) and its story is great too.

Kingdom Hearts Birth by Sleep:
it's gameplay is good, shotlocks are fantastic, but there's practically no story until the ending, which was honestly pretty cool.

Kingdom Hearts Re:coded:
holy moly this one blows. still better than re:chain... but thats not saying much.

Kingdom Hearts HD: Dream Drop Distance:
flowmotion is fun as hell, although a bit broken. story is kinda dumb but it has its moments (AHEM TRAVERSE TOWN AHEM).

Kingdom Hearts 0.2 Birth by Sleep: a Fragmentary Passage
a good introduction to how KH3 functions, but its extremely short.

Kingdom Hearts x Back Cover:
i don't really know what to say about this one. at least they didn't make anyone who wants to understand kh3 play the mobile games. also the GOATS matt mercer and ray chase are in it so...

Kingdom Hearts III: THE GOAT THE GOAT THE GOAT THE GOAT THE GOAT THE GOAT

in all seriousness this game feels like an cinematic event/massive crossover and i'm here for it. the ending couple hours are PEAK.