Very good story, performances range from very good to great and one of the actors look a hell lot like an young Robert De Niro.
The ambition on the story and the whole concept of the movie has to be praised. To be honest, its never boring, and the fact that it touches on so many themes that always makes everything feel rather refreshing.
Unfortunately, the 6hrs will make it or break it for many. In the film's defense, this was released as a miniseries, not a film. Also the movie is split into two 3hrs part, and by the end of the first part it does end, so its like you can see one part and then the other, or watch 1 and half hour 4 part as it was released on TV, if not mistaken.
All in all, while the length is certainly going to scare many, the story and performances are good enough to get you entertained.