That's just not true at all, the vast majority of the criticism came before the 2nd CL Final, and had dried up in the months leading up to it, coincidentally when he actually started to play well. I agree that he took perhaps too much stick after the first one, but it did show beyond any serious doubt that he's not a player in the very top bracket of central midfielders. If we accept that he took too much criticism though, that's not a reason to shield him from everything else, or ignore the other performances that he's been criticised for.
Rather than a Champions League Final though, there was a lot of criticism of him last year, not for failing to best Xavi and Iniesta, but for failing to best Barry Bannan and Jonathan Hogg, for being poor against Southampton, for having a shocker against Gerrard, Lucas and Meireles. The previous season he was appalling against Bayern Munich in the Champions League Quarter Final, not to mention an awful performance against Milan in the previous round which culminated in a dismissal.
Saying that, your theory might be accurate, if you hold that it is, there are still a couple of things that puzzle me though, maybe you can help. Why, if Carrick has pissed on every other midfield he's faced in Europe, has he been constantly overlooked as a top player? Not just by the media, not just by football fans, but by Fabio Capello? Let's not forget, Capello is one of the world's foremost football managers, with a list of honours as long as your arm. Did this managerial great ignore Carrick for the vast majority of his England career purely because of one game in Rome, despite him dominating against virtually every midfield he faced?