I suspect a lot of Americans would be shocked at just how mediocre many U.S. Supreme Court justices are. Almost as mediocre as U.S. Senators, for the most part.
Some of us, who regularly read the opinions of would not be. Some of the nonsense that gets a supreme court judge's signature is truely shocking.
RBGinsberg is an excellent example. She's apparently the IQ of a doorknob, and understands "logic" to about the same extent.