I think that the fact that this is not even an American film makes the majority of the discussion on this thread moot. It was not an American funded film. Though many American films and TV shows are filmed in Canada they are backed by American production companies, which was not the case here. It was a Canadian/Irish production, and a truly international cast, with no American actors (Sutherland is Canadian, Mullen is Irish, Nardi is Italian, Greene is First Nation Canadian, O'Toole is English, with the rest Canadian or Irish). How you can blame the remake on Americans audiences or Hollywood is ridiculous. And you can tell it was not targeting American audiences. It is too slow moving and deep to be made for us low brow yanks.
I do not think there is any problem with Americans having an air of superiority. Each great culture has had its time and then was surpassed by another. It has been the way of the world since "Civilization" began. So let us have our time in the limelight, saving the world, until another country has the capability to take on the leadership role (or our country gives up the role, as is happening under the current Administration). It is said many other people hate American's for their arrogance. In some way's we have earned that arrogance. I also agree that sometimes we, (meaning those Ugly American's who do not try to understand, adapt or adopt to other cultures) go too far. It reminds me of my vacation in Argentina. My wife and I were getting a gelato and I was having a little trouble with getting my flavor choice understood. As we were leaving, he said something in Spanish about Americans only understanding English. My wife is has a fair amount of Spanish and has a little French. Spanish was my first 'second' language, that I stopped learning 45 years ago, before studying German, Arabic and Korean.
Since I did not see the original, I do not know if the ending was true to its roots. I need an explanation on how/why The Professor and The Thief open their eyes in the morgue and look at each other. How, in the end, The Thief walks into the house and The Professor gets on the train. I was trying to make up some reasons, like it was all planned, that they were fake bullets for the Thief and he was the one that was behind the set-up at the heist so they faked his death and The Professor wanted to run away so he paid the surgeon, making their meeting on the train not as spur of the moment as it appears early on. Unfortunately, that makes no sense (but that means it fits in with the rest of the movie).
As for Mullen's acting, I did not know he was from U2 and this was his first acting role. I felt he did an acceptable job. I thought it was just the director and script that limited his role.