I often found professional artists using Blender for certain tasks. So I read often in the Lightwave forum that they like to use Blender for animation. The same can be found in the Modo forum. And many like it for some features like a fluid simulation.

But still they often do not give their major tool up. They use both.

With all this in mind we also have to remember, that at least 50 percent, probably way more of these functionalities are not needed for creating game levels or models. You could do that in any other 3d software as well.