u110 in 41 provided a breakthrough in that it provided warning of 4 rotor naval Engima long before their introduction. It meant Bletchley had already started preparing for 4 rotor by the time it was introduced. It was the trigger for work on the 4 rotor bombes. There were other U boat captures.
American involvement is impossible to play down - convoys were critical to our survival, and there were tens of thousands of Americans based here for much of the war. I'm often just as disappointed when Hollywood plays fast and loose with mainly US operations like Guadalcanal or Midway. Even so Hollywood movies rarely attract the outcry U571 did at the time of release.
I just think we prefer to talk about the parts we played, just as any country would.