Being overturned 60% of the time in cases taken by the Supreme Court is better than average, as the Supreme Court overturns about 75% of the Appellate rulings it reviews.
FiveThirtyEight: Politics Done Right: Washington Times: Supremes Uphold Sotomayor Opinions at Above-Average Rate
Because it only takes cases where there is a reason to question the Appellate courts ruling.
So of Judge Sotomayor's 150 rulings, only 3 have been overturned, so 98% of her rulings has stood the test of time.
And that doesn't mean she ruled wrong in those three cases, the Appellate court is bound by precedent, when the Supreme Court decides to overturn a precedent and set a new precedent, they wait for a case decided by the old precedent to make it's way through the process.

here's an in depth look at the statistics
The Volokh Conspiracy - Judge Sonia Sotomayor: What the Data Show

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“ The subjects of every state ought to contribute towards the support of the government, as nearly as possible, in proportion to their respective abilities; that is, in proportion to the revenue which they respectively enjoy under the protection of the state.”

Adam Smith , The Wealth of Nations 1776

"We have always known that heedless self-interest was bad morals; we know now that it is bad economics"
FDR's second Inaugural Address