Here's a few to start off . . . .
Under-represented:
Hunchback of Notre Dame (ever since they closed the show at DHS)
Pocahontas (ditto at AK)
Mulan (never anything except characters)
Lion King (I know this one is a stretch since there is FOLK at AK, a movie at Epcot, and they used to have the attraction at MK, but this movie deserved a "ride")
Over-represented
Lilo and Stitch (didn't deserve an attraction over those listed above, the musicals are more worthy) (IMHO)
Under-represented:
Hunchback of Notre Dame (ever since they closed the show at DHS)
Pocahontas (ditto at AK)
Mulan (never anything except characters)
Lion King (I know this one is a stretch since there is FOLK at AK, a movie at Epcot, and they used to have the attraction at MK, but this movie deserved a "ride")
Over-represented
Lilo and Stitch (didn't deserve an attraction over those listed above, the musicals are more worthy) (IMHO)