Basically, for SS this year, there were Drew, Ramirez, and Tulo for big offensive producers. They have wOBAs .350 or above, the rest have wOBAs below .330. For 2d, there were 6 over .350 and another 3 over .330. It is much easier and more common to get a good bat for 2d.
edit - there were 6 qualified 2d basemen with wOBAs < .322 (legaue average). There were 15 at SS.