I loved the movie, though I agree that the music was too loud. I thought every single actor nailed it - little mannerisms or ways of speaking that called back to the original performance.
I think the people who don't like it are focused on the fact that Tony isn't the main character, and we see very little of our favorites - Paulie, Silvio, Big Pussy. There wasn't this clear-cut narrative explaining exactly how Tony gets into the family business. I didn't need that to enjoy the movie.
In the series, Tony has this awesome respect for Dickie Moltisanti and always talks him up as such a perfect individual. So Dickie is the main character, and it shows that while everyone else thinks Dickie has it all put together, in reality, Dickie is completely falling apart and losing it, though he was there for Tony when his father wasn't. So that's what Tony remembers about Dickie, and his death spurred him to follow him into the business.