It’s almost impossible for a TV show’s finale to live up to viewer expectations, but a few great installments have managed it. TV shows aren’t designed to end — they’re designed to keep going for as long as possible — so coming up with a satisfying conclusion is tough. A series finale can make or break a show's reputation. Some of the most popular shows in TV history have become notorious for their polarizing final episodes. A few have even proved that a divisive finale can overshadow years of fervent fandom.
https://screenrant.com/good-tv-show-finales-hype-expectations/