I disagree with everyone but Ezra, and even then because she was too good at being an annoying greenhorn. She just came too late to grow, since the major story arcs were in the middle when she showed up.
Also, as the war went on, simmering-rage Sisko became the dominant personality, so I don't know what you're on about.
They started Sisko's character as Black Picard, but he soon settled into the 'beleaguered, tough frontier fort officer' that Avery Brooks excels at.
Bashir and Jadzia had their teething problem,too, but they got over it just as the series got good, so that's a pass.
Nana Visitor nailed Kira's arc top to bottom, I have no idea what you're on about