That's actually a common attitude that I've seen at least in Youtube comments (before I installed an extension to hide them, but that's beside the point). The argument was that persistence and mastery builds character, and that, essentially, everything you do you should do well or not do at all... On the one hand it's possible to see the idealistic virtue of this argument, on the other hand it is, in fact, just a video game, and also the world is a little bit more complicated than to allow the neat division into things we master and don't do at all.