Most of my favorites have already been mentioned. I'll add original Sherlock (Jeremy Brett) and all the after school shows that were on when I was a kid. Gilligans Island, Get Smart, Rat Patrol, Rocket Robin Hood, etc..
The only shows that I was actually sad to see end were Cheers, MASH and Seinfeld.
The only shows that I was actually sad to see end were Cheers, MASH and Seinfeld.