Are court decisions liberal or conservative?

Not exactly. Five of the nine justices are typically considered conservative (Chief Justice Roberts and Justices Scalia, Thomas, Alito and Kennedy), while four are considered reliably liberal (Justices Stevens, Ginsburg, Breyer and Sotomayor).

Justice Kennedy, although classified as a conservative, has voted with the liberal faction on some cases, making him the unpredictable swing vote that helps balance the Court.