Sam jackson looks cool.  Michael keaton, awesome touch.  Great effects.
however...
the elephant in the room is, why bulletproof his entire body except half his face?  I mean, without that exposed area, he doesn't have to hide in a gun battle.  With it?  any lucky headshot brings him down.  Total fail that the bottom half exposed there.  I guess he'll be shot probably 500 times in the movie and nobody will hit that section, of course.  
Look, I can suspend reality long enough to accept robot cop conspiracy premise... but exposed mandible?  I think the the fck not.