Angie has mentioned in the past that turtlenecks and other high necklines are best avoided by short necks. I have found this to be true as well. My mom, who has a short neck, really hates them. Not only were they not flattering, but she found them uncomfortable. Too much fabric in a small space.
Average neck can probably get away with them but I don't know if it's the most flattering option. Still, sometimes we all need a change of pace. I wear them despite being busty so who knows.