I don't know how true of a problem this still is. Are most LCDs now not typically TFT/CCFL? Quality still varies, but I haven't had trouble with even cheap displays if you can use the included controls or software to adjust the gamma or dark/light response. I used to use the Norman Koren test patterns[0] before using a Mac with included wizard.

It's likely much more common for people not to know or try to see how much difference settings can make.

[0] http://www.normankoren.com/makingfineprints1A.html