Edward Norton plays very different twins very well.
This movie was a bit too graphically violent for me.
But I had some more thoughts about it the next day. The look of this one is very clean and the violence is very graphic -- in crystal clear detail. Would I have accepted it more easily if it had been a grittier looking movie? Not sure; however, a grittier look was precluded by the fact that Edward Norton played two roles and the cameras had to be locked down to make that easier to accomplish.