This is a pretty fun sci-fi romp provided you don't think too hard about it. It has its own time travel concepts not necessarily shared by other shows. Season 2 is a genuine improvement and irons out some of the flaws of the first season. The protagonist is deeply flawed and average, and that's part of the point.

I was interested to see where this goes, as the concept is an interesting one. I would have preferred if the focus was on threats to humanity's existence, rather than using it as a backdrop for romantic subplots, resulting in a superficial tone. Was patient untill well into the third episode and then decided that life is too short for shallowness.