There are some scenes that definitely deserve 5 stars but overall, I was bored and didn't feel "hooked" into the story. At times it just felt like it was meant to be a fun project for Pitt and DiCaprio, acting out Western scenes and pretending to live out some boyish dreams.
I loved the scene where DiCaprio is in his trailer cursing himself for being a lousy drunk and forgetting his lines. His scene with the young girl at the saloon took me out of my seat as a spectator to Once Upon a Time and made me feel as though I was right there in the saloon. DiCaprio once again shows us how brilliant he is, and how he's able to make us feel uncomfortable when his character is at its worst.
Pitt brings in that weird loner/drifter vibe with his role in the film and keeps you guessing what illegal or f*&^%d up thing he will do next.
If you love old cars and nostalgia, you will really like this movie.