I think you'll find that most of the people that are complaining about lighting, aren't complaining about the lack of shadows, but the overuse of ambient light. That picture is a perfect example. There is no visible light source in that picture but you can see down the cave tunnel like it is daylight out. The lighting in the cave doesn't even match the color of the lighting on his back.
Well, I can understand that. I disagree with that criticism, given that this isn't reality and they can stylize it however they want, and that functionally, not being able to see at all down a tunnel with enemies in it might pose problems. But I can at least understand it.