I don't know about prestige, but challenging games engage me more. They require more focus, thought, and attention to information.. Right now I'm playing Armored Core V: Verdict Day, and some of the missions are kicking my ass, but I keep playing them over and over to complete all the subquests, trying out different combinations of parts. I don't get that kind of intense involvement with Shadow of Mordor, AC: Unity, or Dragon Age Inquisition, and thus their simplistic systems and shallow content feel redundant.