From The Movie Snob:

Finding Nemo. (B) This was a perfectly enjoyable little movie about a timid little clownfish (voice by Albert Brooks) who sets out on a dangerous quest to rescue his son Nemo after Nemo is caught by a scuba diver. He teams up with a goofy little fish named Dorrie (voice by Ellen DeGeneres) who suffers from the same sort of short-term amnesia that that guy had in Memento. The animation is great as the intrepid pair encounter all sorts of marine life during their cross-ocean odyssey. I just didn’t think this movie reached the dizzying heights of Pixar’s previous efforts, like Toy Story and Monsters, Inc., so I give it a more moderate grade.