The rears are weak, not discrete at all, lets call it ambient surround.
I disagree. This mix isn't quite as 'surroundy' as Blood On The Tracks or his three quads, but there is some unique stuff happening in the rears - isolated keyboard in "Gotta Serve Somebody", horns in "Precious Angel" and "Gonna Change My Way Of Thinking", etc. I could understand some folks wanting to boost the rears on this one, but for me once you really crank it up everything seems to fall into place.