But there is nothing (except for maybe common sense) that prevents anybody from taking any silly game and playing it in a very serious way. Monopoly has a World Championship. James May built a full-scale house on TV in Lego. And some people take playing World of Warcraft extremely seriously, and get all upset when they find out that the large majority of players doesn't consider WoW to be all that serious at all.
There is nothing wrong with taking your hobby extremely seriously, whether it is Lego, toy trains, Candyland, or World of Warcraft, as long as you get your priorities straight and don't neglect your real life for it. What you can't do is forcing the rest of the world to take your hobby as seriously as you do. For the regular guy these are all just toys and games, with no real significance whatsoever. I'm sure there will be long discussions about the role of pandaren monks in hardcore raid guilds, but for normal people the pandaren monk remains a rather silly looking character resembling the Kung Fu Panda in a video game. And while a lot of adults play video games, we are not yet past the point where people generally think that video games are for children. Using characters from movies for children obviously isn't helping.