At the very least the word "automatic" should be deleted. It incorrectly implies lack of discretion on the part of the magistrate judge.
Now, perhaps many magistrate judges may be too willing to issue warrants, but that's a different discussion. And there have been plenty of examples where they've raised important issues dealing with electronic surveillance; I highlighted Magistrate Judge Orenstein's opinion re: warrantless cell tracking in this 2005 article: http://news.cnet.com/Police-blotter-Cell-phone-tracking-reje...