I have to add what is really my favorite series finale: Magnum, PI. I'm not talking about the very last episode to air, which was cheesy and badly imagined. I'm talking about the finale they made one year before, before they decided to do one extra season. It was superbly done, and actually had Magnum passing away, then walking on clouds to heaven with a John Denver song playing. They nicely wrapped up the storyline with him saying goodbye to Michelle, as he sort of "haunted her" and helped her to let him go, without her knowing it.
For the following, added year, they had to clumsily find a way to bring Magnum back to life after the previous show had him going off to heaven. The storyline with Michelle was sort of re-ignited. It was interesting, but had a tragic outcome, although his daughter survived a car bombing in a very unrealistic way. To end the series with Magnum rejoining the Navy and then Rick stuck between saying "I do" or "I don't" was a disappointment. This is one show that needs a reunion movie. All the principals are still alive and it would be good to finish this series off better than it did.
