My absolute favorite television show of all time is Seinfeld! I could watch that all day, every day, and never get tired of it!
A close second would have to be Criminal Minds, then CSI. I love the drama and the process of solving a mystery! Any time there is a marathon on, I cannot walk away from the tv.
And I also love King of Queens, The Office, Teen Mom, Intervention, Everybody Loves Raymond, and anything on HGTV.