I was just thinking and wanted to give my opinion of the 3 worst final episodes of TV shows ever.
3rd worst (Garbage Medal) :
St Elsewhere (Mid 1980's )
It was bad when Dallas made an entire season be the dream of a character. Even worse (though not quite bad enough to make my list) when Newhart had the entire series and everyone in it the dream of a character played a decade earlier by the actor playing the main character. But to really take the cake, this show had the entire series, everyone in it and the entire background the dream of a minor character only introduced in the final season (this show wasn't a comedy either. ) To make it worse, the dreamer was a retarded child rateher than a psychiatrist.
2nd worst (vomit medal) :
Seinfeld (late 1990's )
Not only was the majority of the episode clips from earlier shows, it ended a very succesful comedy in a very unfunny manner - all 4 of the main characters sent to prison - for something that wasn't a crime in any state. Pitiful.
Worst Ever (shit medal ) :
ALF (Late 1980's )
To be fair, this wasn't intended to be the final episode - and wouldn't have been bad had it not been. But it was a season ending cliffhanger and ended up being the series finale, leaving everything up in the air. Nearly a decade later, after the ALF character started becoming popular again (through commercials and minor appearances in a couple shows ) a TV movie was made, but most people no longer cared.
Interestingly, in the early 2000s there was a show about a teacher dating a famous actress (show name escapes me) that also ended the series in a cliffhanger - what made this one bad was it was the 1st season and the show hadn't been especially succesful.