I think you're missing, perhaps, seeing it in a theater. Ugh, I miss too many movies that way ... and I know they suffer for it.
Or, it may not be your cup of tea.
Or, you may have really poor taste.
I don't think there was necessarily anything "epic" about it. It was just about some good themes of greed and vengeance and human personality disorders and the oil business of nastiness and the religion business of hokum and freakiness.
I thought it explored those themes with some facsinating, well-played characters, and interesting situations.
End.
Sorry you didn't get it. Eh, it just didn't work for you.
Too bad. Great film. Worthy of the many Oscar nominations it received and the critical raves it garnered.
In my most humble opinion.