I played it, beat it, loved it. Sure I had some issues with it, and I hope they release a Final Mix DLC or something like they planning to do to fix some of the more glaring issues (like almost complete lack of post-game content), but it was still quite enjoyable.
Also in regards to the original point of the thread, who is KH for? Folks who grew up with the series, folks who enjoy action RPGs, folks who want to explore Disney worlds... Just because something is aimed at kids doesn't mean only kids should enjoy it, nor does it mean adults shouldn't enjoy it. Media is media, regardless of intended audience, so questions such as "who is it for" are a bit pointless in my opinion. When I play a game or watch a movie or tv show, I never occupy myself with questions of "am I the intended audience" or "should I really be enjoying this?" I just see if it's for me and my personal tastes. If it is, great, if not oh well. Implying that KH should only be for kids or enjoyed with kids seems like a minor form of gatekeeping that is wholly unnecessary. And that's honestly the main reason I've refrained from posting in this thread until now.
Anywho, it was a great game with some issues. Yoko Shimomura brought it with the soundtrack. Especially near the end of the game.