The worst thing about that part of the game was that Donald and Goofy suddenly become totally helpless. They're all like, "OMG, a reeealy weak heartless is after us! We better run instead of killing it like we've been doing to all the other heartless!" Seriously, if they were gonna have them get scared and run, they could've at least made Sora a powerful heartless...
No. Just no. You can't compare Harry Potter and kh. Reading Harry Potter does not take even half as much time as playing kh does. Then, for Harry potter, it gets shorter because in movies you don't need descriptions like you do in books (plus the Harry Potter movies sucked anyways, so...). They could leave anything that's unnessicary out of a kh movie, and it would still be too long. They'd have to start taking out important things. And don't forget, it's not just the cutscenes they'd have to put in a movie, They have to put the actual battles in there too... And if you add up all the times of the cutscenes, it's already over 3 hours... almost 3 and a half.