One difficulty games can work well if done right. But then you need to be really good at balancing and making games. Multiple difficulties can truly screw up the scaling of the game as can be seen in Skyrim. Instead of adding an easy/normal/hard setting you can add them as "paths" in the game. Something dark soul kinda does.
I'm against all this give monsters 200% damage, players do 50% damage crap and vice versa.
Completely linear "movie" games like Max Payne3 I see the point of sticking to the old easy/normal/hard formula.



