I've never read any of the Lee Childs novels on which this film is based so while I was aware of some fan issues around the casting of Tom Cruise as the titular Jack Reacher my review is purely based on the film itself.
When a public shooting that kills five people seems to be an open and shut case for prosecutors who find their perpetrator quickly and conclusively they are surprised when under questioning the only thing he asks of them is to 'Get Jack Reacher'. But who is Jack Reacher? Turns out he's ex military and living off the grid but who already knows just where to turn up when wanted! So begins an investigation that soon makes everyone realise this case is far from open and shut...............
The main problem I found with the film was a surprisingly one dimensional performance (based on, in fairness, a thinly written character where depth is supposedly inferred from his extensive abilities and almost nothing else) from Tom Cruise and a plot that whil not especially complicated is nonetheless quite dull actually. In fact, dull is the best word to describe the film overall as it ambles in no particular hurry to a conclusion designed to set up a franchise for Cruise that might help him out when he becomes too old for Mission: Impossible. Except I don't think I'd be bothered if I never saw the character again on film.
Certainly, it did not do a lot for me.