I don't listen to the radio because I don't enjoy radio music. I do sometimes listen to Internet radio, which is (obviously) a really low quality signal. But there's something weird I've noticed...
Low quality streaming music, especially RealAudio, sounds good in a way I can't explain. Occasionally I will bump into a band on a low-quality audio stream or get a low-quality sample of a band that I like. There is no doubt that the low-quality encodings sound like crap, but when I get the CD I am always surprised at how "bland" sounding it is. What once sounded like it was going to be great, sounds boring.
In all of these cases it's been metal since that's what I listen to the most. I think it may have something to do with the high-end being chopped off, the nasal-whining-fatiguing sound of the guitars disappearing, and the rhythm becoming more predominant. Am I crazy? Any other ideas?