Not 100% sure but during the game Max drinks a lot and i think this is there to show that he isnt 100% ok.
I finished the game and i liked it a lot. It is far from easy and the story is good. I miss the surroundings of the first 2 games but its stil a good game.
There are 3 things i disliked tho.
In the first 2 games you could sneak up to the bad guys and listen in on their conversations and that was fun at times, also the stuff they would say when they would spot you.
But in this game they all speak Portuguese so i dont have a clue what they are talking about.
The other bit is that when your carrying multiple weapons and you have lets say weapon 2 equipped then a short cinematic comes and when it ends your holding weapon 1 again, kind of a pain if immediatly after the cinematig a shootout follows.
The last bit is that when in MP1 and 2 i was in a room at a door you could sometimes hear people talking at the other side of the door. So i would jump thru the door using bulletime and kill all or most of the bad guys in that room before bullettime would finish.
In Max Payne 3 this isnt possible. When you try to jump thru a door using bullettime it is like jumping into a wall.