Firstly, I want to say that I do enjoy the series. I don't think it deserves any awards but it's fun to watch. Nor do I think it's a "masterpiece" as some have called it. Far from it.
I like all the characters but one. Syndulla. I don't like how the show portrays this character at all. How this character became a general is a mystery. The character feels that being a general she can do whatever she wants. Being a general does afford a person a great amount of latitude in many things but you simply can't do whatever you want. She has a flippant attitude and acts like a petulant child while shirking her duty. Her childish attitude caused the death of a few pilots at Seatos. She should be arrested and charged with conduct unbecoming, disobeying orders, utilizing Republic property without authorization, dereliction of duty, and involuntary manslaughter. This character is an annoyance and detracts from an otherwise decent show.
Like some others have stated I would also like a little more backstory to the characters relationships with each other. I get that the writers want to keep an air of mystery and reveal things slowly but at a certain point I am going to stop caring about the relationship dynamics and lose interest in the show. And by the way, leaving things open to audience interpretation is lazy storytelling.