I see it all the time now. It's supposed to make the screen look dirty and gritty but I don't really understand the purpose. Are they trying to make the games look more theatrical? If that's the case then it really doesn't make sense to me considering keeping the lens clean is a very important part of cinematography.
Does anyone actually like these effects or is it just something forced onto the games by overzealous art directors? To me it just muddies up the image and takes me out of the game.