Oh that's interesting. There's been comments here about Dean being a dark hero and how that creates an interesting character (which, I agree to a certain extent), but I must admit I like watching "good" heroes - or ones that CAN function in a world that isn't. I think to a point Sam and Dean do a good job of that of the most part. Considering what they've been through they could be much much darker. I doubt Dean (or Sam) will ever be as wholesome as Steve, but the idea that they might rise above their current state of darkness and function above it is hopeful.