Even youtube for which there is no official app which Google did not allow MS to deploy has excellent thirdparty app like TUBECAST which has all the features of yourtube app on Android. (gogi.in)
Thing is, look at how well the Wii sold, yet thirdparty support was quite poor, even Nintendo didn't release many games which is the case with all of their consoles. (gamechup.com)
OMG dude is the KING of thirdparty sales not happy with all that money WoW and GH are bringing in. (jgghgames.com)