Really? When he was getting some minutes at the 4 in Miami and Minny he was doing between 15-19ppg, and getting 6rpg or so. Its not what you want from a #2 pick, but its far from terrible.
He played SF next to Kevin Love in MIN when he put up 19ppg and that team was terrible.
Also the Suns did play him plenty at the 4 shortly after he was taken out of the starting line-up and he still could do nothing with his opportunity.
So far this is Beasley's worst year by far, so that should tell us the Suns are using him wrong in some way.
I don't know the T-Wolves were better when they stopped playing him, I think the Suns have started to figure that out and are now using him properly.