I would have to ask what they like first:

Do you like boring ?
Do you enjoy grinding the same monsters for hours on end ?
Do you like to have a cut-scene just for an npc to tell you where to go ?
Do you want to explore an empty world full of copy pasted terrain ?
Do you have fun just smashing the 1 key in every fight ?
But most of all, do you wanna level up to cap level, just to find out there is nothing to do ?

If he says yes to any of those questions, this is HIS GAME!!!