Anyone who grinds like crazy will get tired of it. I'm a Destiny fan, but I turn my Xbox One off and take breaks from it and do other things. If you feel burnt out you should do other things for awhile. Lol I think I've opened maybe only 30 or 35 chests over the weekend and obtained only 2 Legendaries and a single key. I have to say I'm satisfied with it. House of Wolves will last longer if you pace your play. :D