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/usr/share/doc/mpg321/BUGS is in mpg321 0.3.2-1.1ubuntu2.

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* There are many unimplemented features. Some have been implemented recently
  (lists, shuffle, etc) - others are more difficult and haven't (downsampling.)
* libmad isn't nearly as fast as mpg123 on hardware with a floating-point
  unit. There are some 'hot spots' highlighted in the TODO file; you may
  want to contact Rob Leslie <rob@mars.org> to find out more about optimizing
  libmad.
* When outputting decoded mp3s to files or stdout instead of a sound device, 
  if the mp3s in question have different channels (stereo versus mono) or
  different bitrates, the sound file will come out fairly jumbled - playing
  at double-speed, or at the wrong intrinsic rate, or something else.
  This can be fixed within libao, but it is a non-trivial job.