Which game engine is ideal for a 3D RPG?

I am thinking about making a small RPG. I know some basics of openGL, but I do not want create my own engine.

My criteria are:

1. Ease of use


2. Can do rpg game


3. 3D

Which game engine is ideal for a 3D RPG?

Answer

it is absolutely Unity3D, and the basic version is for free.

http://unity3d.com/

Good luck