I'm not sure why I'm spoilering this, since I won't tell you anything specific, but just to be safe...
The movie is in the same genre as Goodfellas and Casino. I love those movies, therefore I should have loved this one too! But something was missing. It was...mild. The plot never went all the way to 11. It was good, but it didn't do anything that Goodfellas and Casino hadn't done way better years ago. Without them as the yardstick, I'm sure this would have been a brilliant movie. Alas, it did not live up to the expectations.