Haven't finished Mad Men, so I couldn't speak to it. Though I am planning to because it's become a lot more interesting to me as I've grown older compared to when it was new.

As for Game of Thrones, it doesn't fit into my list because the quality of the writing really nosedived, starting in season 5 to my mind, though seasons 6 and 7 is where it took a turn for the drastically worse. And season 8 was a disaster. So it's exactly in the opposite group that's too long to exhaustively list.