Hemera Technologies/PhotoObjects.net/Getty Images
Television executives don't keep around shows that are smart, funny, compelling and engaging; they keep shows that make money. So some of the best shows ever made were canceled too soon while some terrible shows—nearly all of reality TV—continue to air year after year. If it were a decision about quality, none of these shows would have been canceled. Lucky for the TV viewing public, some of the worst cancellation tragedies have been rectified. Placing these shows in any sort of order would be like ranking the beauty of summer days on a scale of one to 10.