Actually, when I'm talking about maxing out, I'm talking about at 1080p, which is pretty much the industry standard currently. Anything higher or lower, there are going to be a lot less benchmarks. There's starting to become more and more 1440p and 4K res benchmarks, because, surprise, they just started to hit the consumer market at a reasonable price. Look at every benchmark for every GPU of the last few generations, what is the constant? 1080p, Ultra, AA turned all the way up.
And consoles, such as the game Watch Dogs, are running at 768p, and probably on medium textures. And again, maxing out would imply that you actually -max out- the game. So AMD and Nvidia saying that you need a $500 card to do so is not false information. You're not -maxing out- the game with lowered AA. Perhaps you just don't really understand the phrase 'maxed out', as you simply haven't gotten it yet.