All of your posts are incredibly condescending, and no you're not doing something wrong if you're not doing Mythic dungeons. Likely due to being forced to form groups the archaic way (There is a reason that MMOs in general moved toward automated group finders.) very few people, comparatively, will run Mythic dungeons.
In fact one of my only worries about this expansion thus far is that focusing so much effort on Mythic dungeons will bite Blizzard in the ass.