I didn't care all that much for Game of Thrones...I thought it was overrated. My friends kept talking it up constantly, and I really tried, but it just never measured up to the hype they were giving. I thought The Adventures of Broody Special-Man (or "The Witcher") was a better fantasy show in my opinion. But it's not "complete," so it's not allowed.
The best show I've watched lately was Steven Universe. It has some of the best world-building I've seen in a fantasy show, and some of the strongest character development. But it's a cartoon, and that's also not allowed.
So within the strict criteria established in earlier threads, M*A*S*H is the best that I've ever seen. The television show takes place in an era of American history that few people are very proud of, and even fewer will ever learn about in school. McCarthyism, the ethics of war, the moral dilemma of duty vs. humanity, etc. The characters are absurd and clownish, but the real joke is the whole premise: is anything more ridiculous than having a hospital in a war zone? "First, they shoot them to pieces. Then they ask us to put them back together again. Why? So they can shoot them to pieces again!"
-Hawkeye, probably