I am completely mystified as to the adulation displayed for this movie. Long thinking Hitchcock as a master of movie making, recalling my memories of seeing Rear Window, The Birds and Dial M for Murder, along with iconic scenes from others in his portfolio, I was hyped for a good film experience.
I was impressed with the opening credit run, which I though quite stylish and innovative for the period, thus sustaining my anticipation. After an opening scene, tailored for Grant's trademark screen persona, the film/story quickly begins to disappoint, in no small way due to the fact that Grant was entirely too old for this role; or perhaps the role itself was illogically written. Even the casting of his 'mother' (an actress just 7 years his senior) begs the question.
While the lead role casting may begin the disillusionment, it is quickly joined by the consistently bad directorial performance. At this point, we haven't had enough of the story unfold to even know the premise behind all of the action thus far, but you wonder if you want to stick around long enough to discover it.
In short, there are episodes of Batman, the TV-series, which have every bit as much charm, suspense, action, and logic, as NxNW.
Having researched the film's background, I suspect the screen writer, Ernest Lehman, for whom this was his first original screenplay, was overly influenced by Hitchcock, who'd apparently had certain action scenes he'd long envisioned filming. And, yet, even those two most visually iconic scenes disappointed, due to either questionable plot context and/or implausible action sequences (the details of which are far too many to list here).
Lastly, though charming as a British accent may be to Americans, there were, laughingly, so many from leading characters in this film, it almost needed dubbing to believe it was set in the U.S.