The writing was so frigging good..the way characters stories intertwined with one another....the story would be blown to bits then come together at the end. Every 1/2 hour show was like watching a movie. As a kid, I liked Kramer...as I got older I loved George and even gained an appreciation for Elaine who is hella underrated. JLD can act her ass off.
But how many shows are there that have so many memorable non-regulars? Soup Nazi, Babu, the BO guy, Jackie Childs, Bubble boy, The broad with the big hands, the close talker, the virgin, Rifkin, the gay couple, etc... Show was frigging genius.