It looks like some reporters are latching on to the number of times Sonia Sotomayor's decisions have been overturned by the SCOTUS, as though it tells us something about her. But it doesn't mean nearly as much as they seem to think it means, simply because there is no particular reason to think Sotomayor was “wrong,” and the Supreme Court “right” based solely on the fact that the Court overturned her.

Liberals and conservatives alike can, with great ease, point to SCOTUS decisions that they think were incorrect. Having a decision overturned by SCOTUS doesn't necessarily mean a judge was “wrong”; it may just mean that the majority of Supreme Court justices at the time disagreed with her.