Avery is clearly a good perimeter shooter. He's got a nice stroke from deep, and the numbers back up that observation.
On the other hand, he is not a very efficient scorer. This is due to him taking a ton of pull up long twos (the most inefficient shot in basketball), and being a sub-par finisher around the rim.
I think some people are confusing being an efficient scorer with being a good shooter. Avery is a good shooter, and I believe that if he can learn to take better shots, and be put in better positions, he will become a more efficient scorer.