Sabremetrics are for the basketball illiterate.
While I don't completely agree with this, I don't completely disagree with it also. I think there is a lot of fantasy basketball GM types and others not involved in the game that use sabremetrics to justify some opinion they have that just seems against what I have been watching(example: people trying to convince me some years ago that Bargnani was a good defender because of some massively advanced stat from a sabremetric site).
On the other hand though I believe some sabremetrics are extremely useful tools for coaches. No not PER or ORTG of Win Shares. I'm talking numbers like points in the paint, FG% against, 3PT% against, FG% of a player based on the position of the floor they shoot, etc. Maybe those are not sabremetrics but basic stats but my point is I believe stats can be an extremely useful tool for breaking down teams and creating strategies to defeat a team or for your team to reduce its ability to be beaten.