Torres scored 24 league goals in his first season with Liverpool from transferring to another country in an inferior team.
Dzeko has not been critisised by Mancini for no reason.
It doesn't matter how many goals Torres scored for Pool. Dzeko scored a lot for Wolfsburg too. If Dzeko is criticized by Mancini, Torres will surely be criticized by Ancelotti if he keeps playing like this.
Will that make Torres a bad player? Or if he moved to Milan instead of Chelsea and he played the way he plays for Chelsea, was it going to be logical to say the same things you now say for Dzeko?
Face it, you watched Dzeko only for City where he's below average for a month and a half. If this is how good he really was, do you think City would have bought him at all for so much money? If he had "such an awful touch, lack of movement" and if he was "throwing himself on the ground all the time" I tend to believe it would have been noticed by the scouts of Juve, Bayern and City and they wouldn't have tried to buy him for ~30m.
This being said, I kinda hope he keeps playing even worse till the end of the season. City's impatience could easily result with him being transfer listed and sold for twice less.