Using ratings from IMDB, redditor ChallengeResponse created a series of charts that explore ‘TV finales that surprised/disappointed’.
He then sorted the data by: the greatest difference between average and last episode’s ratings; highest average episode rating; highest last episode rating; and alphabetically.
IMDB Ratings of TV Series Finales Relative
to their Average Episode Rating
Sorted by Difference Between Average and Last Episode’s Ratings
Sorted by Average Episode Rating
Sorted by Last Episode’s Rating