60 FPS matters in ALL games. There is more temporal information. Things look sharper, more detailed - and this adds to imemrsion - pretty important in an RPG. Animations are not only more detailed but more fluid. And most importantly there is a significant difference in control responsiveness. Everything from navigating the GUI to actually manipulating the game/your character.
Anyone who tells you differently is working for Ubisoft marketing. ;p
Now, there are certain game types in which it's tolerable to play at below 60 FPS, but those games tend to be the ones that are easiest to run at 60+ FPS, and regardless, they would STILL be better at 60 FPS.