Don't understand the praise

Rating: 3/10 (6 August 2019)

As for any Tarantino movie, I was expecting something different, something new, something riveting. For sure, this movie is from a genre I'm used to watch. Actually, I don't even know what genre it belongs to... definitely different from anything else.
On the positive note, I really liked the atmosphere, visiting this Hollywood from the 60s, the dresses, cars, houses, streets and studios. The music is excellent and serves the movie well.
So, what's wrong? Well, first of all, the plot. If you are not familiar with Sharon Tate's story, you won't get it. I read about her afterwards and finally put the pieces together... too late to really enjoy, even retrospectively, the movie.
The actors, apart from Pitt, are underused (Margot, where were you?). Why destroying the idea we have of Bruce Lee? What's the point? Why shooting a movie about Sharon Tate's possible tragic ending and not having her present more than 10% of the movie?
Finally, in my opinion, the movie could have been much more rhythmic if shorten by an hour. When you start checking the news on your mobile in the middle of a movie, it's generally a bad sign...
It's not because it's a Tarantino movie that we have to deify it. I read many critics that I just don't get: I would be curious if they would have been similar if the director had been John Smith...