I just don't think guns fit in that world but I'm also not the person who created it so it's really not for me to say one way or the other, I just think magic and bows are good enough for shooting.I don't think they need to get rid of guns, just make it longer to reload, and make a percentage of your enemies immune to bullets.
I forgot one other thing I'd like to see them do, make the balverines look more like werewolves than they did in the last game.