Just so you know, I'm not a big fan of Luther Head, so this is more about being fair. Head, according to his measurement records at the NBA pre-draft camp showed him being 6'2" without shoes and 6'3" in shoes. He has fairly long arms and is an above average athlete with just under a 40" vertical. He was a very good shooter in college and has a lifetime 3 pt shooting percentage of slightly over 38%, which is pretty good and a little above average in the NBA. He's know for being a combo guard and he handles the ball just fine. He's also a decent passer of the basketball. He has a lifetime assist to turnover ratio of very close to 2 to 1, which is also considered good. He built his reputation as a defender, and is known for being able to defend both the PG and SG positions. Right now he is struggling big time with his 3pt shot, and mostly because of taking poor shots.
Now if you want to criticize his shooting, I think you have plenty to criticize. But just because he's not shooting the ball well doesn't mean he flat stinks at everything else.