Yup, there seem to be many, many poorly connected Morpheus Ultrapeers. I don't know how they decide how to become an Ultrapeer, but their Algorithm has some flaws. When I force LimeWire to be an Ultrapeer, i've got hardly any leaf nodes (maybe 10 - 20). And almost none of them are Gnucleus or Morpheus.

If this doesn't change, Morpheus could easily make the whole ultrapeer-system useless, regarding the fact, that some 60% of all gnutella users use morpheus.