[P]eople didn’t analyze and discuss TV with the same rigor that they do today. If they had, they likely would have noticed that Sunny took Seinfeld’s “no hugging, no learning” formula, threw it into a blender along with a healthy portion of debauchery and reckless abandon, cranked that blender to “HIGHLY EXCESSIVE” and then consumed enough of the resulting concoction to transform into a sort of sitcom Abomination. It was beautiful.

That's one of the best descriptions of It's Always Sunny I've ever seen.