I agree with what seem to be your thoughts on Sanderson, though I think the progression is backwards. if you read his earlier stuff, it is WAY more uh...juvenile and optimistic than, say, Way of Kings. Way more. I think he's making strides, even if I don't ever think he'll write anything you could call "gritty".
But Way of Kings is coming along nicely, and I really liked Mistborn. Mostly. Ignoring the teenage romance. Mostly I read his stuff and marvel that his outlook on life is clearly much more positive than my own. I'll just be over here in the Joe Abercrombie corner of cynicism.