If you're looking for games that run on Surface RT, you'll have to stick with what's in the Store.
If you're looking for games that run on Pro, just look for anything that runs on Windows
I just posted a video on YouTube earlier this morning of mine running Splinter Cell Blacklist:
[video=youtube_share;JD4oFgVpMuw]http://youtu.be/JD4oFgVpMuw[/video].