It wouldn't be any different than viewing 3D movies in AR/VR. You get the same stereo information you get normally, just without any of the specific stereo artifacts (cross-talk, etc) associated with the native 3D technology. It's actually pretty underwhelming because the perspective depth you're getting from the fixed stereo perspective looks awful when contrasted with proper head tracked stereo perspective.
I think I'd want a Mario game where I'm platforming using the textures of wallpaper as platforms like I used to imagine when I was a kid. Or similarly playing Tetris using the silhouettes of objects in the room (which seems to happen naturally after you've been playing far too much.)
Saw another cute childhood game-turned-Hololens-game called, 'The Floor is Lava', turning your household furniture into platforms to crawl over.
https://www.microsoft.com/en-us/store/p/the-floor-is-lava/9nblggh51k2d