I really enjoyed it. It appeared very authentic and didn't cut any corners with acting, props, costumes, locations or cinematography. Supposedly, it cost $49M, so it had a theatrical budget and it showed. It's a sad that some people have complained that it's "slow." I didn't find it to be that at all.
While watching, it struck me that one of the movies that established Harrelson as a star was Natural Born Killers, and here is he, 25 years later, playing a character on the other side of the law in the story that served as its principle inspiration.