Ehh .. I feel like I'm reasonably open minded about how a suit can fit and how designers can reinterpret things. Some things are just bad tailoring.
If you take that extreme of a relativist view (ie "that's just how some guys want their suits to fit"), then it's impossible to judge anything. You could say that for books, movies, music, art, etc -- yes, these things are all subjective, but you can also reasonably say some things are good and some things are bad.
I am not disagreeing that the tailor is bad, nor that the fit of the suit cannot be judged, but only that to judge the fit of suiting in a movie is a pretty silly exercise except to judge whether the choices accurately reflect the character being portrayed. In this case, I would say yes, the non perfect suiting is in keeping with the character and his back story. If we were going to make a movie about the life of Manton, maybe not so much.
I mean, why should a guy like James Bond have "good taste?" An appetite for expensive things and women, sure, but high taste levels? Unlikely. I imagine that if James Bond existed in real life, he would be an insufferable douchebag who is unwilling and perhaps unable to see any number of his own shortcomings.
I guess that I should say that this comes from first hand experience with "self-made" guys who like things like cigars, nice cars, and nice clothes - from tech entrepreneurs to successful fighters. I guess that I see James Bond's personality as being somewhere in that range.