Super Mario World still looks like crap though. You're not going to do well with a game that whose graphics were put in a filter while a lot of other games had art made from scratch with screen darkening in mind, and I think it's a terrible example of a point being made.
I know, that's part of why I posted! Each game is different and shouldn't have the same technique applied across all games, especially when they simply lowering the brightess.
Edit: I'll mention again that my core problem with this filter is that it is poorly implemented, causing colours that should be bright regardless of screen/system to become dull. Whites become grey, etc.