Too much of a contemporary mass-market blockbuster
For a movie that takes place in the early 1960s, this movie felt WAY too much like any other contemporary action blockbuster, with everything moving at a thousand miles a minute and inducing nauseating sensory overload with frenetic action and hardly ever pausing to even catch a breath or to develop its characters and story beyond a superficial level.
This was yet another mass-market action-fest, like most of Guy Ritchie's recent movies, or anything from Michael Bay, or whatever new generic production is coming out of the MCU this month or next month.
This is EXACTLY the kind of thing that today's audiences uncritically gobble up. So why did this not do well in the box office, when it met ALL the criteria of a contemporary multiplex blockbuster?