People need to realise this is backwards compatibility in name only. What it really is, is a heavily patched version of the original game made to work on xbox one. If something won't work it will be changed. They are taking the games back to the development level and getting parts of the game to work under emulated models and other areas are replaced with newer code to work with the newer hardware. Graphics drivers for the 360 may be replaced by close copies that access the xbone gpu directly rather than emulate the original.
When you put in your 360 game the xbone accepts you have the rights to that game and downloads the patched game for you free of charge that will work on xbone.
I have absolutely no problem with this but where as the original xbox games had small patches the xbone solution is downloading the whole patched game.
This means game support is limited to how many software writers are thrown at the project. Under-resourced and the supported games will trickle out.
It's still a really brilliant thing for Microsoft to be doing though, no question but its not really backwards compatibility as only a tiny subset will get support, likely the easiest patches and the most wanted.
