well that proves one thing. Most people wont calibrate their TV sets to get the maximum quality simply because they dont know
But the question is how much "uncalibrated" a TV set is before calibration to make the difference?
TV that were factory adjusted were purposedly adjusted to be "off" specs to make them "stand out" in the showroom floors in store hoping to lure uniformed buyers into thinking that tv looks great. How much uncalibrated or off specs the TV is varies from different type of models to models. But pretty much any TVs that were made after 1995 or so were really off specs. White is too bright, black is too dark, and color is so oversaturated such as blue is too blue and red is too red. edge enhancements, sharpness were overemphasize which introduce more annoying video noises to the picture...
I have a 27" TV that was made in 1993 that looks a heck lot more accurate and natural out of the box compares to the TVs that I owned that was made in 2000, and in 2003.
But of course, I recommend anyone that own TVs that were made around 1995 or afterward, to do some basic calibration by themselves. chances are their TV are really off specs. If you own a dvd player, such as playstation 2 would do, and you own some dvd movies that are "THX Certified" such as Pixar "The Incredibles", or Terminator 2: Extreme Edition, they have some basic audio/video test patterns included in the disc, just inserted the disc into the dvd player and follow the instructions on those audio/video test patterns to do the basic calibration. Once you are done, the picture will looks more accurate and natural...Hey, it doesn\'t cost you any money to do so...