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"TV (The Book)," by Alan Sepinwall and Matt Zoller Seitz - who write at HitFix and New York magazine, respectively - rigorously ranked TV shows using a point system based on six categories: innovation, influence, consistency, performance, storytelling, and peak (how great the show was at its best).
The two writers used the system to come up with a wonderfully diverse list of TV comedies and dramas over decades, and they include essays about each show that remind you why you love the shows you love, or help you discover a new gem.
Here are the 10 American TV shows they consider the best of all time, ranked (note there are a number of ties):