Then again, maybe understandable, since he's a veteran ex cop in the midst of tweakers, junkies, madmen, and generally people not well geared for success in life. And it makes for bigger payoff when we DO get a situation where anantagonist actually does get the better of him - that tells us we're dealing with a sharp customer.
What great frickin' writing.
It should give every greasy shiny suit film executive a bowel-evacuating fit of shame that a support character like Mike gets more audience engagement than a half billion bucks spent in SWeIX: TRoS or Justice League or that godawful Marvel Immortals movie.
Hey, Finance Guys: you find creatives you know are good (y'know, using that newfangled notion of Domain Knowledge), you give 'em a kitchen and you let 'em cook.