Im a huge fan of the show, I haven't even finished the first season and im saying that.
Being said, the only issue I have is how emotional they all are during space travel. At the base level, people should be well intune with their emotions, and all petty dramas shouldn't be something to expect although its a lot of what you'll see.
One man being jealous of another man getting with a girl he has a crush on, so he throws a swing at him WHILE BEING IN SPACE. It makes no sense to be out of space and so attached to something as such.
Thats just one example, it just doesn't make sense to me. Hence the 3stars