Seeing you post makes me register for an account here, hahaha
True that the reaction for the film is really bipolar
I have watched the film, 7% of rating being 2 stars or less seems fair to me, and I honestly expect higher low score as I really hate it.
I guess for people who hate the film with passion, giving a 1-star or 2-star is a no brainer, and if I can, I would give it a negative star.
Reason 2 and 3 does not seem like the reason behind of the low score.
WOM is not that good, the score of Douban is really low. But the marketing company did mobilized a lot of KOL to promote the film and encouraged people to go watch it. I guess that worked.
By the way, marketing companies would also pay for some companies to help them get higher score in social media. It's really common in China, as well as Hong Kong.