Žižek is a populist derivative hack, and so is Klosterman, but damn if they aren't entertaining as hell.
But they're right. Seinfeld is probably the darkest, most misanthropic, philosophically fulfilling, and most important show that has ever been on television. And it's amazing that it doesn't matter who I show Seinfeld to (and I force a lot of people completely opposed to it to watch it), they all suddenly understand. Like as kids they saw it and there's no way they could grasp it, and it just looked like a shitty sitcom, but there hasn't been one yet to suddenly have it click as to why it was so damn good.
But through all that, despite how much I love the show and respect it, and find it hilarious, I still don't know what about it that I actually find funny. It's just a straight up morbid show, and it shouldn't be funny, but it somehow always works. It's similar to Curb Your Enthusiasm, but there I can derive a lot of the comedy from the ridiculously embarrassing self-deprecation. Seinfeld is just... a class of its own comedy.
I do like the comparison to Always Sunny as well. Calling it Seinfeld vulcanized by PEDs and the Internet is dead on.