Jackson, Sanogo, Hawkins have all been in the 16-17 mpg range, you could argue he should have played them more. Sanogo you could see immediately would be a star, Jackson had the potential and has blossomed this year, Hawkins you can see the potential and the need for his shooting.
What's more bothersome than the relatively slow development of future stars, is the consistent DNPs for guys who may not be stars, but who could still add great value in a key role (e.g. Diggins as ballhandler and free throw shooter to protect a lead down the stretch).
Whereas Polley and Gaffney seem to have plateaued, they just don't seem to be progressing. To me that devalues their skills a little. I like the Jim Calhoun approach of optimizing for March, not December.