2 and a half hours of nothing, no plot, no story, just Tarantino showing off his love of 1960's Hollywood and the movie business. It's one of the most boring movies I've ever seen, even with excellent performances by Pitt and DiCaprio. The final 10 minutes are a total cop out as despite teasing the Tate murders in all the trailers he bottles it and goes full gore porn and changes history.
Avoid this dross unless you need help sleeping.