It’s actually kind of impressive that a movie directed by the Russo Brothers, and starring Ryan Gosling, Ana de Armas, Chris Evans, Billy Bob Thorton and Jessica Henwick could be so utterly mediocre and forgettable.
Evans should absolutely be playing more villainous roles, he seems like he’s having a ball. But other than that, The Gray Man is little more than a mishmash of ideas from other action movies that have all been executed better elsewhere.
The result is something with no definitive personality of its own — just overlong shootout after overlong shootout with aimless, scattershot pacing. It feels solidly half again longer than it actually is.
There’s much better action films out there, don’t burn two hours on this.
NERVE.SQUID.PILOT 
Given the reception the Russos’ post-Marvel works have gotten, it seems that the competence they showed with Marvel was a fluke.
Their pre-MCU stuff with Arrested Development and Community was really solid, but I haven’t loved anything of theirs post-Endgame.