Recent tv show? Nothing. Of all times? No clue, since that's a bit too difficult to say off the top of my head. Frasier ranks up really high for the comedy department. I like X-Files or Supernatural for thrillers. Science fiction has almost never had anything decent on tv (sorry to all 'Whovians') that wasn't axed for silly reasons (Babylon 5, Space Above and Beyond, ...). As for other genres, nothing's coming to mind.
Passing along the question.