I myself will be sticking to Blender with the game that I am making. As for others, I cannot say. Since this is a fun fan project I cant really see the point of going over to commercial engines that cost money or to languages most here do not know.

And Blender does do games well! Check out YoFrankie, or a recent Mario Galaxy spin off fan game:

http://www.youtube.com/watch?v=BGqyv...eature=related