As I spoke about two weeks ago, some great TV shows go unseen by audiences during their original air dates. They can fail for any number of reasons, but most shows are ultimately cancelled based on viewership stats. If a show isn't watched, then advertisers won't pay for commercials during that time slot, then the network has little choice but to cancel the program. Others may have just not been marketed correctly, or were on a network that not a lot of people knew about/watched. When Veronica Mars was on the air from 2004-2006, all of these factors probably played a role in its ultimate demise.
