In my opinion season 4 is the weakest. Definitely the weakest one out of all the seasons. It was very out of place, and it needed focus like the other seasons have.

The performances were still great though. And I really liked the last episode and how they ended it. I'm going to miss the show, but at the same time I'm glad it's over.

For my ranking from best to worst, it is:

Season 1

Season 3

Season 2

Season 4

I'll give the entire series an 8/10.