If you get Elena Kagan to write an opinion and Clarence Thomas to join it it is safe to say there is little room for legitimate complaint against the opinion, particularly when all of the court joins. There is something to be said for Sonia Sotomayor's concurrence suggesting that Congress had not thought the law through but as written this is the decision demanded by that law. SCOTUS is hardly infallible, but a unanimous decision negates any argument that partisanship, activism or religion played a part. When Samuel Alito and Ruth Bader Ginsberg read a law the same way the complaints need to be directed to the Congress that wrote it, not the court the read it.