Yeah it is a decent game. Max's dialogue does drag on a bit but most of the time I don't mind his dark, cynical view of the world.
Think there's aspects of Max Payne that R* can integrate into GTA V, like the shooting mechanics which are brilliant and the slow-mo when your about to die during important missions. The cover system is OK, but needs a lot of work, I feel moving from cover to cover often leaves you exposed as you can't crouch probably once in cover. Still though, just playing this excites me for GTA V cause if R* do draw in the good parts of Max Payne then it could arguably be one of the greatest games ever, because the shooting will at last be on a par with the driving (I quite liked the driving in GTA IV personally!). And no doubt they'll nail the environment, story, characters etc. as they always do.