To be fair at least in the States a large drink (any size pop actually) is only a dollar, so it's not really that bad. That stuff is like what 1 liter?
edit: eh. Only 500 ml. Ok, you're better off buying a 2 liter pop at your local grocery store then.
edit 2: wait fuck. That answer came from those British punks. Yeah I'm convinced the US large is fat fuck larger for sure. Back aboard the $1 McD soft drink train. CHOOOO CHOOOOOO!!!!