First of all, Seinfeld was a great show...but, the final show sucked.
My observation is this...what final episode of a great sitcom hasn't sucked.
1. MASH- BJ refuses to say good-bye to Hawkeye, spells out good-bye in rocks as Hawkeye's helicopter flies away. Talk about stupid 2. Cheers- Sam Malone says, "I'm the luckiest son-of-a-bitch on the face of the earth" Boy was that a disappointment. One of the best parts of a sitcom is the half hour format. When writers of a sitcom are forced to do longer show, the shows often fall short of expectations. Such is the case with Seinfield, Cheers, MASH etc.
If it wasn't such a cash cow for NBC to do 2 hours, the best thing Seinfeld could have done was a great 30 program and call it a day.
But hey, as the writers of the Simpsons are so quick to point out...who are we to judge a program after they have given us so many hours of great FREE entertainment.