What's worth playing on Xbox 360 that's not more easily accessible through Steam or GOG? I stuck to PlayStation back then because I was mostly interested in RPGs, so I'm not really sure what's worth checking out (and yeah, I still need to play Mass Effect, even if the last game was controversial - but that's definitely better on Steam or GOG).
Forza Horizon 1 was never released on anything else (although you can play with BC on newer Xboxes), playing through Xenia is mostly fine, some occasional bugs.
Nice to see, but it's pretty far behind the Windows version at the moment because the Vulkan renderer isn't as accurate and doesn't support upscaling.
And since vkd3d-proton started working with the emulator recently, that means the D3D12 renderer works using the Windows version, yielding much better compatibility and graphical quality.