The saddest thing about the series finale will be the impression the non-Seinfelders will have of the show. By this, I mean that with all of the hype surrounding the final show, many non-viewers will have tuned in to see what it was all about. Upon watching the show, many will say "big deal". Even though the clips were good, there are always many little details that lead up to the funny parts that were missing. Only the long time fans of the show will know why most of those clips were funny to begin with.
Of course, many of the longtime viewers will find it easy to run the finale into the ground because it somehow did not live up to their high expectations. How sad of you who would do this, to put down the show that for so many years made you laugh so easily. The cast did go out under a cloud of bad news as it was reported that Jerry was mad at Jason Alexander for slamming the show during a PBS interview.
The show was great for many years, and to measure it by the last episode (as many will) is simply sad. Only the true fans will appreciate that the hype (furnished by the media, not the cast) would raise the expectations to a level that would be impossible to meet. This show was given more attention than the Superbowl. Rarely can an event of this magnitude deliver what the consumer wants. If you cannot view the program for what it is, a TV sitcom, then the joke is on you.