There is no one camera used to shoot all TV shows. For example "The season finale of the popular TV show House, which will air on May 17th, was filmed entirely with the Canon 5D Mark II." Source: http
/petapixel.com/2010/04/09/house-season-finale-filmed-entirely-with-canon-5d-mark-ii/
Here's an example of a movie that was shot using various cameras "Black Swan": http
/nofilmschool.com/2010/12/darren-aronofskys-black-swan-shot-16mm/
Movies and TV shows shot with the RED cinema cameras
http/www.red.com/shot-on-red/cinema
I'm sure some are shot using the ARRI Alexa or some other ARRI camera:
http/www.arri.com/camera
A look at the Panavision site will also give you some of the cameras used to shoot movies and tv shows:
http/www.panavision.com/home
The amateur appearance has more to do with the person using the camera than the camera itself. Are you looking to buy or just curious as to what is being used?