I found this article on the HuffPo website discussing the noise on the AM bad. The author, Fred Lundgren, talks about firing up his SuperRadio III after the power died and marvel at how clear the AM sounded without all the interference from other devices in the house.
I especially loved this paragraph: "I think it can be successfully argued in a federal courtroom that AM Station licensees and AM listeners have not received “due process”. The FCC, by its failure to regulate interference, has aided and abetted those who are causing the interference. Their inaction has allowed every POS imaginable to take a steaming crap on the sound of AM Radio."