These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Shark Tale
Designated Hero: Oscar makes plenty of stupid and/or selfish decisions during the film - like using the pearl his girlfriend gave him to get him out of debt to bet at the races.
Brittany: Did you know that dolphins are just gay sharks?
Never Live It Down: The film is essentially a giant amalgamation of all the things people hate about Dreamworks animated films. They've actually improved tremendously, but people will never let them forget this film.
So Okay, It's Average: Let's face it. While it's probably one of Dreamworks' most, uh... trivial films, it had done its job of being entertaining. Also counts for the heartwarming moments and little tearjerkers. They are there. The story is pretty compelling on its own even if you don't have to try that hard to get every reference.
Uncanny Valley: While the sharks don't appear to be that bad, the fish have this very awkward combination of a human's face and a fish's body... unfortunately, calling the personal servants to everyone's personal fears "awkward" is a gross understatement....