I just ran across this site: http://stats-for-the-nba.appspot.com
It's the only site I know of that gives Regularized Adjusted Plus/Minus statistics for this past season. RAPM should be of better predictive value than adjusted +/- , and much better than unadjusted +/- (on/off statistics). (See this useful introduction to this and some other common "advanced" measures: http://www.goldenstateofmind.com/2011/12/6/2602153/advanced-stats-primer).
I'm not interested in re-fighting the past arguments we've had about playing time. I'm excited for the future of the Jazz. I'm not suggesting this is the end-all-be-all stat, but am just offering this as another point of information to consider, especially if you (like me) had not been aware that this data was available.
Here's the RAPM for the Jazz 2012-13 (the number is the calculated team points per 100 possessions the player is responsible for compared to the NBA average):
-1.4 Marvin Williams
-2.8 Mo Williams
-0.7 Rush (2011-12)
-2.3 Richard Jefferson
Take a look at the site yourself to see the breakdown of the player's contributions offensively/defensively.