Well, one advanced stat is as good as another, I guess. How many folks know and have a good understanding of which factors go into PER or WS and how they are weighted?
For what it is worth, I think an interesting, rather simple stat that tracks offensive effectiveness is simply how many points a player either scored or assisted per touch of the ball. Not intended to be a perfect stat (doesn't gauge the value of off-ball actions such as setting a great screen). But generally does a pretty good job of identifying players the defense should probably pay attention to.
Of our high-minute, rotation players (all these guys got over 1900 touches. No other of our players still on roster got over 1000), here are the numbers:
Jeff Green .420 points/touch
Avery Bradley .390
Rajon Rondo .377
Jared Bayless .364
Brandon Bass .356
Jared Sullinger .349
Kelly Olynyk .325
Phil Pressey .289
Kris Humphries .280
So, there's that.