I watch Seinfeld at least once a day, sometimes as much as three times. I usually know what episode is on within 30 seconds, but watch anyway, because there are always three or four threads, and I'm always intrigued by how tightly intertwined they are.
I enjoy the stories told by the characters, like Kramer driving the bus to save the piggy toe, or George saving the whale ("The sea was angry that day, my friends...").
George makes the show for me, because he's such a jerk, and so transparent.