"The law also prohibits subpoenaed businesses from revealing to anyone, including customers who may be under investigation, that the government has requested records of their transactions."
I couldn't find the actual section in the law which says this (the quote if from the article itself), but if "anyone" does in fact include anyone, you could end up with a situation where government agents can have access to a wide variety of information without having to show "traditional" just cause to a judicial body, and no one will ever have any recourse for an abuse of that power since no one is allowed to tell "anyone" that the information has been obtained.
Frankly, I'm not an American so I really couldn't care less, but I get a little bit tired of constantly hearing about how the War on Terrorism and the invasion of Iraq is all about "freedom" when the blowback result is that your Government keeps diminishing that freedom. The somewhat surprising thing, in my mind, is that you may be slowly losing what you cherish so much, and you are willingly and blindly following along and parrotting "It's a good thing".