A stunning visual trip for the eyes, a can't-help-but-sing-along musical for the ears, and an all-around entertaining & plotless adventure for kids and the young-at-heart. Even it sags here or there (or gets a little too surreal), the fun songs, delightful animation, and wordplay make it a wonderful film.
It's hard for me to write a fairly critical review of "Yellow Submarine," as I've grown up watching it (I've probably seen it 25 times) since I was young, and I love it to death. The mismatched art styles, the completely arbitrary musical numbers, the irreverent asides and drug-addled loopy dialogue. It just never gets old, and is probably one of the most entertaining animated films of all time.