This performance is legendary and he played the character for 9 years, getting better and better with each episode.
Rewatching the series I still laugh at and with him the way I did for the first time and yes, I even watch certain scenes only for his sake.
While I love the other characters as well and find the series's philosophy extremely interesting, I can't stop thinking that without Michael Richards, it wouldn't have been enough.
Nowadays you can read many things on how new TV series have more quality acting-wise but the truth is, most of the actors on Seinfeld (not only Richards, but Jason Alexander as well and many others) give better performances than any other artist in today's series.
The worst thing about Seinfeld is that sometimes I worry my neighbours are disturbed by my laughter.