Short: Good, not great.
A bit flat. A little too much show don't tell in the opening five minutes followed by too much tell, don't show for the entire rest of the movie. A lot of declarative position statements by characters. Dialogue not, overall, as lively as I expected from a Lee Child-derived story. Decent score by the composer for The Way of the Gun.
Rosamund Pike is great. Richard Jenkins is fine. Werner Herzog is ok. David Oyelowo is good but not great. The actor playing the sniper is largely a maguffin with very little screen time. Robert Duvall sleepwalks his way through his bit part, but he's fun to watch even when he doesn't seem to be trying very hard.
Central casting issue: as for Tom Cruise and the fact that he is nowhere near the physical size of, and far prettier than the character Jack Reacher, the differential is ignored. This let's-pretend-size-doesn't-matter has problems in that Cruise comes off more blustery than I think of the character as being, when he's not coming across as somewhere between supernaturally smart and the so-Zen-he-doesn't-exist assassin of William Gibson's Bridge trilogy. When someone who looks like Tom Cruise walks into a room, peoples' reactions are generally different than when someone at least the size of Dolph Lundgren walks into a room.
The size differential is minimized by camera work and there's a lot of the film done in close-up headshots, with Cruise is frequently shown from below his chin and with the top of his head out of camera shot - most of the time he's shown with the top of the screen placed somewhere between mid-forehead and hairline, suggesting he's that tall.
Versus the book: Lee Child's novel is a much more engaging page-turner of a thriller than the movie is. Overall mildly entertaining.
* Pacific Rim - Idris Elba. Godzilloid giant monsters. Giant mecha. I'm already there. Summer.
* World War Z - Brad Pitt. Summer.
* Zero Dark Thirty - Despite the fact that the CIA has felt the need to formally state this is fiction, and the problematic issue of torture apparently working in this fictional universe, I'm still looking forward to it.