Autodesk have expanded their wings with their own game engine called STRINGRAY. The cool part is its integrated with Max, Maya & Maya LT, so now its much more easier to build and even test it just by switching to stringray. Although they target for small studios, i still think that its a good approach even its still early to compare with Unreal or Unity game engine.
Whether you’re a developer creating 3D games or a design professional creating real-time visualizations, the Stingray engine helps you produce visually stunning 3D experiences
For more infor check the link – http://www.autodesk.com/products/stingray/overview