Once Upon a Time in Hollywood is the most boring and unwatchable Quentin Tarantino film ever made. It’s a film that’s nothing more than 2 hours and 5 minutes of setup followed by 35 minutes of payoff. The only reason people like it is because of those last 35 minutes and that’s it.
Problem is by the time of the climax I was far too bored to care, so all in all it was nothing but a three-hour long borefest for me.
I suspect the reason this movie got such positive reviews was a case of The Emperor’s New Clothes, where people refused to acknowledge the movie was terrible simply because Tarantino directed it.