I suppose one could question the "superdelegates" and other aspects of the primary process, but the primary election results still show that Hillary won the majority of votes and the majority of contests.
Votes: 16.8 million for Hillary, 13.1 million for Bernie. Contests won: 34 for Hillary and 23 for Bernie. (There were contests in Guam, Puerto Rico, the Virgin Islands, and the District of Columbia and a few odd groups, which is why there were more than 50 contests.)

Although some changes may have helped Bernie, it's clear that Hillary won the primary election. For the most part, the election was fair - and the shortcomings would not have made a difference. So, I'm with Sarah Silverman:

To the "Bernie or Bust" people: You're being ridiculous.