Idk but the writing he gets for his movies has been outstanding.
I think it's his creativity. See Sicario versus the pretty lackluster sequel. Denis is just inspired. Who the hell makes a sequel to a cult hit and possibly even one ups it? I think Prisoners might be his best. It's one of the best thrillers I've seen, but also manages to be a pretty good character piece for both Jackman and Gyllenhal. All the characters are well realized. Maybe that's his gift, making characters that the audience can relate to, that the audience can engage with.
Yea he's got something.....
Picking the right screenplays that plays to his strengths could be it too, absolutely. Not wavering into a desire to crowd please. Respectful to source materials.