With the recent release of the finale of a certain film series, people are mentioning the term 'anti-climactic' again. (no I haven't seen it)
But this tends to be true of most series.
Finales are probably the most difficult thing to write. No matter how good, there is always someone who is disappointed. Perhaps authors should be like Terry Pratchett and continue writing until you cannot write anymore. Then again, that also reminds us of never ending soap-operas. Or series that deserved a finale but were cut short.
What are the best and worst examples of series finales? (series of at least 3)