Incomplete. Striking down an unconstitutional law is not legislating. Striking down a constitutional law is legislating and there has been plenty of that.
Striking down a law isn't not legislative if you agree with the Court on the Constitutionality of the law - and legislative if you disagree.
Striking down a law is not writing a law. It is telling the Legislature (Congress) that “nice try, now back to the drawing board” - for CONGRESS to rewrite the law, or not, based upon the findings of the Court as to the troublesome aspects of the law.