For the most part, I think network TV is getting better.  These are some quality shows that people are not watching, and because of that, they are in danger of being cancelled or in some cases, have been cancelled.

According to zap2it.com, the cancellation bear is breathing down the neck of the following shows:

ABC- Don't Trust The B In Apt 23, Private Practice, 666 Park Avenue Last Resort (all canceled), Happy Endings, Malibu Country 

CBS- Made In Jersey, Partners (both canceled), CSI:NY, Vegas, The Good Wife, The Mentalist

NBC- Do No Harm, Animal Practice (both canceled), The New Normal, Guys With Kids, 1600 Penn, Deception, Whitney

FOX- The Mob Doctor, Ben And Kate (both canceled), Touch

CW- Emily Owens, M.D. (canceled), 90210, The Carrie Diaries, Hart Of Dixie, Beauty And The Beast

Just because the show is on the list, it does not mean the show will be canceled (unless noted), what it does mean is if more people don't start watching, it may not return next season.