I feel like there is a lot that we still don't know about the game. That being said, I would not be surprised if half the fun in the game is just the nostalgia for those of us who grew up reading the books or even watching the movies. For instance, I don't know how "cool" non HP fans will find the common rooms for each of the Houses, but I'm looking forward to it.
That being said, if you like open world games with optional quests and dialog choices then this might be worth looking into. The game takes place like 100+ years before the events of the books and nothing from this time period has ever really been discussed in canon. So from that standpoint I don't know how much prior knowledge is required.
Sent from my SM-G996U using Tapatalk