Having taken a look at the examples in Viewers Are Morons
, it seems to me to have a lot of overlap with the Goldfish entry and Show, Don't Tell
. A lot of other examples are not cases of assuming the audience are idiots, but rather that they don't have knowledge of a certain topic. And I know it's annoying for those in the know to have to wait through exposition of the topic, but it's necessary in a show that will go out across an entire nation and possibly beyond, and wants to be for the masses (which need not be for purely commercial reasons, or be accompanied by genuine dumbing down).
It's in need of help, but I'm not sure what to do. Examples that could stay are The Emperor's New Groove
(sort-of in-universe), Yu-Gi-Oh!
(the America dub makes things more evident that the original), and the various guidelines for developers and laws for advertisers that state how much things should be explained.
(Forgive me for a personal note, it's just that one seems to me outright wrong, the World of Warcraft
example. The devs weren't assuming players are incapable of learning a new rotation, they are fighting against the idea that if one spec does a few percent more damage on logs of the best players you should switch to it or you're gimping your raid. Actually most players do best in the spec they are most comfortable with and bandwagon switching is more likely to hurt your performance.)