A lot of sequels are unsuccessful due to wholly unnatural extensions of the original. Finding Dory has no such problem. Following the events of Finding Nemo, it only makes sense that the blue tang voiced by Ellen DeGeneres would want to swim across the ocean to find her parents. That predictability is definitely not a problem, but it does hold the film back from transcendence. It tightly follows an easily navigable pattern: complete this mission, move on to the next one. Not every plot development is predictable, but every resolution is. That is, except for a truly astounding ending that breaks all sense of believability. True, believability may not be the most important factor for the movies examining the Secret Life of Marine Animals, but one still expects limits. That is not a complaint, though. The entire film could have benefited from this go-for-broke mentality.
I give Finding Dory 5 out of 7 Septapus Legs.