The day they (Google, YouTube, whoever) fixed YouTube via Wii U's Internet Browser (Can play and watch YT videos again) is also the day they disabled embedded YT videos. Now, you can't play embedded videos on sites like here on vgchartz. Here's a embed video (Try on Wii U browser)
It either has a blank screen with no play button or a thumbnail with a play button on the middle, but it won't play as if you're just clicking on a photo.
Wii U's Internet Browser is internet done right on a console, but with this limitations of YouTube not allowing; not be able to be watched anywhere, it takes away the ease- of-use out off an amazing browser. YouTube better fix it asap!
ps...embedded Dailymoition, Vimeo, etc, videos work fine.
Wii U Demos in *FPS* View ;)