I looked at the "Advanced Fielding" stats available at Baseball-reference.com.
Ryan makes no errors on catching throws and relatively few fielding errors. He's made only 33 fielding errors in his career.
However, in the same time, he has made 80 (eighty) throwing errors. I couldn't find any other 3B who had a similarly lopsided split. Beltre's numbers are 131 fielding and 108 throwing (over a longer time), Wright is 78 and 78. Rolen is 140 and 45. Zimmerman already has 35 more throwing errors than Rolen had in his entire career.
It obviously is his downside to his tremendous fielding game but I think it sort of makes sense with his injury history on his arm/shoulder/whatever it was.
