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I think it's interesting how the "best TV show" of all time is assumed, de facto, to be an hourlong drama. Find me a single episode of any show better than Samurai Jack's "Seasons of Death," or the Simpson's "23 Short Films About Springfield," or imagery better than Planet Earth or Blue Planet, or funnier than All in the Family or Arrested Development.
And apparently, the best TV show has to be American. It may shock you to know that they have televisions in other countries and even, sometimes, produce their own shows, like, say, "Traffik."
But even if what you mean by "best TV show of all time" is "best American hour-long drama of the last 15 years," Buffy's a serious contender, and is notable for being, really, the only serious contender from a network. All the others are pretty much from HBO.