Actually, compared to most of the standards out there, I find mime
refreshingly simple.  It actually solves a problem, albeit
with more mechanism than I would like.  I don't want to go back
to the old days of n different ways to encode cruft into a
mail message.  I also find it quite easy to present the mime
encoding as a pretty simple hierarchical file system.  I don't
really need anything to replace MIME since the only thing I'ld
be getting is a bit more simplicity and little else.

If I were to throw stones at anything it would be ASN.1.