DR varies greatly with genre even when performed live. I used to play drums mostly in small clubs in a rock band. Every style of music uses more and less DR. Most popular rock/pop performed live also uses very limited DR.
The following TED presentation by David Byrne illustrates my point better than I could:
http://www.youtube.com/watch?v=Se8kcnU-uZw&sns=em
The following TED presentation by David Byrne illustrates my point better than I could:
http://www.youtube.com/watch?v=Se8kcnU-uZw&sns=em
I don't know how you can honestly say there aren't many really poorly mastered recordings out there unless you've completely ignored pop/rock/jazz/country for the last 10-15 yrs. I've checked out a lot, and a dynamic range of 4-6 (i.e. peak amplitude above rms amplitude - in dB's - in the loudest parts of the music) is common, as is a frequency spectrum with the average amplitude from 5-15 kHz equal to or louder than the 300 - 2000 Hz range. IME, the better the system the worse a recording like that sounds, but from an iPod with average 'phones it can sound OK.