It's not that "Romanzo criminale" is a bad movie. It's only a movie we've seen so many times (from the Godfather to Once Upon a Time in America) done so much better.
Storywise, although it is of Italian origin, "Romanzo" is as bland as any new mafia movie, dealing with revenge, honor and family. The script is rather tedious too, with very few moments of sparkle, and even though the movie looks good, it only starts to feel like a watchable movie in its last quarter. And as if it weren't enough that the film is mediocre, it also bears resemblance to an odyssey if we are to consider its playing time and the way I, as a viewer, interpreted it.
The one interesting aspect is related to the political facet of the mafia, and especially to the situation before the fall of the communist regimes. But this definitely doesn't make up for the weak plot. All there is...is a series of events, linked to one another, sprinkled with love but far too hollow to transcend. Sadly.