Yes, it would be great if I can plug my Xbox 360, and DVD player into a Tablet computer, and use the screen on the Tablet to watch cable TV, but I believe there are no input video and audio plugs like HDMI, RCA, Coax for most Tablets.
Play video games or watch TV with the screen on the tablet if you are going somewhere which does not have a TV or monitor for connecting to your game console or cable TV or DVD players.