If you've got the expertise to create high-end games, then Unity is a powerful application to help you design them. Unity sports a stylish GUI and is strictly for professionals in high-end game design. It features state-of-the-art game design tools such as extensible graphics, particle effects, highly optimized scripting, and something called the Ageia physX Engine. In addition, you'll get skinned character animation and even tools for making standalone games for Mac and Windows (plus Dashboard Widgets and web-plugins).
Unity is a very powerful 3D gaming development tool that can produce stunning results in the right hands.