Seinfeld wasn't supposed to be funny. He was the straight man. Everybody around him was funny, and that's what made the show good.
The problem with that line of reasoning is that no one on the show was funny. There was not one second during the entire run of the show which was even slightly amusing.
This is either one of the worst exaggerations I've heard in a long time, or you are a big-time masochist for watching nine seasons of a comedy show that you do not find funny. For the record, I find the first two seasons the funniest and dislike the direction the show took in later seasons.
If your cardio still allows you to hear the show well, then I would recommend Twilight Zone, even though it's not in the sitcom arena.