Off the top of my head: Borderlands 2, Bioshock Infinite, and Mass Effect 3 all have OpenGL support. I can start naming random games from Steam if you'd like, but that's just pointless.
OpenGL is the premier open graphics standard developed by the graphics industry. It widely used on desktop platforms and pretty much universally used everywhere else as sysrpl mentions.
Microsoft has already strongly adopted web standards (incl. WebGL), I don't see how it would be crazy if they adopted graphics standards too. It might even help make their mobile platforms relevant.