The award was for most popular. It should not be a surprise that BfA won.
BfA certainly has it’s problems and I have pointed some of them out.
The other poster said it well, if the award were for the least popular or most disliked, BfA would have probably won that award as well.
I did not see a big marketing campaign by Blizzard for these awards - a simple forum post that was mostly trolled and perhaps a tweet.