I’m not sure I agree with all his choices – some of the shows were totally axe-worthy in my books (like Millennium and The Lone Gunmen) – but there were some great shows killed off over the years.
Otherwise, I’m in total agreement with Kevin. The show I miss the most is totally Firefly. Joss Whedon crafted an incredible show, he had a great cast (Nathan Fillion! Morena Baccarin! Ron Glass!), and it was one of the most unique, engaging shows I’ve ever watched. Sad, but true.