Wow! What a twist! M Night Tarantino has done it again!

Rating: 5/10 (22 November 2019)

It's Brad Pitt's film, and one of his finer performances, in my opinion. DiCaprio's character was almost completely superfluous to the "plot".
Do this: Get a digital copy of the movie, get some editing software, keep all of the scenes that Brad Pitt appears in and cut out as many of DiCaprio's, and any other's, non Pitt scenes as you deem unnecessary(to the... Pitt plot). Et voila! A story!
You're welcome.
I give it an honest 5/10, primarily because it's unnecessarily long. I should give it a 1/10, for balance, but I... just couldn't do that... to the lovely Margot. :-)
I'd quite comfortably give the "Pitt plot edit" version, that exists only in my head... for now, a minimum of 7/10.
Of course... there are those who would argue that the whole "Helter Skelter" business was but one act in the ongoing live action roleplay known as Project Fear and/or Chaos, and nobody really died that day.
Not me though. Heaven forfend!