I saw it last night, I thought it was a really good movie.
As far as comparing it to The Godfather? It's a gangster movie, of course it's going to have similarities. I thought Denzel did an excellent job, Russel Crowe did a good job as well. I dont really have any complaints, it was just a really well put together movie. I thought they captured the era, and did a great job of taking you back to that time in American history. I really liked how they used authentic news casts to add to the feel of realism.
I dont know if it was as good as The Departed, but it's definatly up there as far as recent gangster movies are concerned.
I'd give it 8.5 out of 10, highly recommended.