I am just now starting season 7 and my biggest takeaway so far is how much of a change in tone there seems to be.
A lot of the early seasons were seemed to be all about optimism and had a really nice positive feeling to most of the episodes. Now it seems the show is much darker and more sarcastic, especially the character of Sam Carter.
Her character was my favorite and she used to be very optimistic. Now it seems like everyone is sassy or angry