I don't think its a bug.. if I understand this correctly.. Pressing back button on the screen will only take you back to the app and continue playing the movie. If you need to get back to the movie you need to Right click or swipe up...
I know I read that somewhere.. yeah I remember in the verge review of the surface...
There is nothing wrong in sharing your opinion but share yours.. don't blindly pass someone else's opinion as yours..