She's a terrible character and actress. Kirk, Picard, Sisko, Janeway, she ain't.
This I totally disagree with. She is a good actress. She was credible in Walking dead and credible here. The problem, when there is problems, is the writing. You can only do so much with what is written as an actor/actress.
For the other stuff its why I think they should have made her captain from the start. As the star she interjects in important moments. It sometimes feels as if she is preaching or lecturing or just being insolent. If she were captain she would not have to preach anything to anybody. She would just be giving orders.