It makes me sad when people post from ignorance.
On your Nexus 7, using a third party app, you can play almost anything. On my iPad, using any one of dozens of third party apps (Azul and CineXplayer are the two I have used), I can play almost anything.
This difference is that on iOS, if you do happen to convert your video to a specific format, there is a built in app that will read the Meta-info to organize your video files into Tv shows and movies and display all sorts of helpful information.
There are many reason to choose Android over iOS, but the ease of transferring, organizing and playing video is not one of them.