A few strong episodes and visually-stunning moments/scares elevate an overall story that oftentimes feels long-winded and overly melodramatic.
"Green Book" is certainly an unconventional Best Picture winner.
A few thoughts:
Those viewing this movie as an attempt to be a thought-provoking and complex statement on racial tensions in the 60s may dislike this movie and judge it harshly.
Those viewing this movie as a buddy comedy, like "Planes, Trains, and Automobiles," will enjoy this quite a bit. And like that Steve Martin film, it relies almost entirely on the chemistry, and caricature-like personas, of its leads.
Shortly after watching this, I discovered that I had seen the inferior version of the movie (the British version). The last two shots -- which imply a future romance -- felt out of place, and I was relieved to find out that the American version left these shots out.
I was reminded of Carol Reed's The Third Man throughout the last third. These scenes, featuring Fabian navigating the city's dizzying streets, are wonderfully nailbiting. The first third feels the clunkiest, however -- I initially found Fabian to be a very unsympathetic character.