It could have been good, heavily edited and stripped down. It was at least an hour too long. It became boring and monotonous. Drifted through the last half of it, numb to it, very forgettable because of that. One-track film that seemed mostly unnecessary.
Not to say there weren't brilliant bits, and it's one of Leo's wilder performances, but all the same... 1 hour too long, and just ends up spinning its wheels for the last half, as Scorsese goes full-bore, straight ahead manic aggressive Scorsese without variance. As I said, made me numb and slightly irritated by the end.