Working on the very dynamic song Sparrows. and listening closely to the mix leads me to be disgusted with mp3 compression.

Of course it's always been there with mp3 files, but we tend to say "oh, at 256K they aren't so bad" and get over it.  Well, they really are so bad, especially if you've got a clean 24 bit .wav file to compare them to.

I don't know, I've read that some people prefer that sound, and it doesn't surprise me.  I used to "like" the sound of cassette tapes...