I admit that I have a few MP3s from Amazon with squeals and a few AACs from iTunes with fuzziness, but saying that's worse than 8-track, AM, FM, or cassette is ludicrous.
8-track : Like telephone hold music but in stereo, a complex tape path designed to add fluttering effects, and CLICK-THUMP right in the middle of a song.
Cassette : Full frequency response range if your head azimuth exactly matches the recording head azimuth, choice of bad SNR (Dolby off) or bad fluttering (Dolby on), and increasing fluttering with age.
FM : Pretty good frequency response, massive dynamic range compression, dynamic range limiting to keep receiver IF and DEMUX PLLs working, amplitude pumping, and dropouts.
AM : WTF