Good endings/Bad endings
Make your lists. Feel free to add why. Could be helpful to future writers...
BAD ENDINGS
Harry Potter (stupid camping trip, final year should have been set at Hogwarts, Snape storyline wasted)
The Natural (disgraceful change to 'feel good' ending to satisfy Redford's ego)
Sherlock (ironically, because they catered to the fans!)
GOOD ENDINGS
Whatever Happened to Baby Jane (killer twist)
Shallow Grave (the money shot!!!!!)
The Sixth Sense (killer twist)
The Usual Suspects (killer twist)
M*A*S*H* (compelling first hour story, nice second hour character wrap-ups, BRILLIANT goodbye from BJ)
Newhart (THAT is how you use a dream to end it)