Except Shinzon has no reason to hate the Federation and ever reason to hate the Romulans, the Romulans were the ones who were making his life a living hell, the Federation did not know he existed. Having Shinzon's ultimate goal to be the destruction of Romulus would have made sense and would have put the Enterprise in an interesting position, they have fight tooth and nail to save the home world of one their greatest enemies. Instead we got a cliched "We must save Earth" plot line and Shinzon hates Earth and the Federation for no good reason. Heck why would the Remans go along with this plan, instead of taking revenge on their oppressors, they going to destroy some people who never did anything to them? That is a pretty stupid form of revenge, it be like if a man killed another man's family and for revenge that man kills some completely innocent guy for no good reason. That doesn't make sense. That's why Shinzon's motives made no sense, he wants revenge against people who didn't even know he existed, rather then the people who actively ruined his life. I would believe Shinzon as a conflicted character, if the conflict was between his hatred of the Romulans and his basic human nature, there is no reasonable conflict, because Shinzon's goals don't make sense. I could buy Shinzon as a conflicted character if his hatred was justified, you say he has legitimate reason to hate the Romulans, even though committing genocide against them would be monstrous. Shinzon has no legitimate reason to hate Earth, so where is the conflict, why does he hate Earth in the first place? There is no believable conflict with Shinzon's half assed motivations.