Continuity mistake: When the movie ends, Mr. And Mrs. Darling, Wendy and Nana are by the window looking at the sky. In the aerial angle they all disappear.
Continuity mistake: When Mr. Darling is getting dressed, a jar of water suddenly appears no the night table behind him.
Chosen answer: He's too much of a bumbler and too cheery (for example when he tells the crew "good morning" and they wanted to know why it's so good.) They probably also see him as a fool and brown-noser since he's always trying to make Hook happy. To the crew he's just Hook's assistant and not a real pirate at heart.
Bishop73