I say that because of the inconsistency of his moral standards, and their not infrequent immorality (e.g. "Pen Pals," "Homeward," his strange lack of attention to the extensive life that will be wiped on on the Ba'ku planet in Insurrection, keeping Livingston in his ready room).
While the show obviously intends to depict (or at least position) him as highly moral, I don't think it succeeds. I think he's deeply moral from a Watsonian and Doylist perspective, but not from a descriptive point of view.