It looks like this concern is starting to get public notice, but just to spread it a little wider:
ABC has a write-up of the arcane policy of super-delegates.
The upshot, in my understanding, is that in the Democratic primaries, the ordinary voting folk choose 3253 of the 4049 total delegates (a little over 80%). 796 (19%) of those delegates go whatever direction they please. Any reasonably close race and even some unreasonable scenarios would certainly end up being thrown into the hands of those super-delegates.
My feeling is that if the ultimate winner of the primary is also the winner of either the popular vote or the regular delegate vote, there won't be a problem.
But if the voters go one way and the super-delegates make the primary go the other way, it'd be a catastrophe for the Democratic party.