Best Movie of the Nominees for the Year, but Not Perfect

Rating: 8/10 (11 February 2020)

This won BP because it was the best overall movie based on all of the nominees. It had good: acting, directing, original screenplay, score, and cinematography.
All of the other nominees were good in only one or two categories, maybe three. But this movie checked all the boxes.
If you only wanted acting, you see Joker or Irishman; if you only wanted visuals and cinematography, then you see 1917; if all you wanted was acting and set design, then you see Once Upon a Time; if all you wanted was actresses, then you see Marriage Story, Bombshell, or Judy.
But if you want the whole package, then this was the best movie of the nine nominees as a whole, and that's why it won. When voters vote, the ultimate winner is also decided by how many 2nd place votes a movie gets, so the winner will gets lots of 2nd place votes in addition to the 1s, and that's finally why it won.