Considering they've always fucked up Prof X's accent (the character being
American), it's a bit late to start complaining about lack of attention to detail in that regards. But it does show a lack of respect on the directors' part for the integrity of the characters.
Looks like the opening is a bit soft. Doesn't surprise me - there are just too many comic book (and comic book-like) movies jostling around each summer, and the ones that don't have an obvious reason to go see them will get lost.
There's no big hook to this movie to get people into the theater. The
X-Men movies to date didn't create some huge curiosity to see their origins. Who really cares where or why they came about? None of the actors are big draws. It's an easy movie to ignore.
I personally can't see either McAvoy as Prof X or Fassbinder as Magneto, although they might be perfectly good actors for other roles. As a longtime
X-Men comics fan, I just don't recognize the characters as they've been presented in the movies, and the trend has been getting worse as the series goes along.
For
X-Men to have a Bond-like atmosphere (if true) is just completely wrong for the story. The comics in the 60s never had anything Bond-like about them. They were far too serious for that.