1) No, he wasn't portrayed as "naïve" (and honestly, you aren't really using the word correctly). I don't really know what you're referring to in regards to his apparent failure to "prepare to save his own life" when there are countless examples of Clark, well,
saving his own life and the lives of others. He's regularly portrayed as someone who is not only incredibly powerful, but also incredibly smart. He's outsmarted his enemies countless times and proven himself a very shrewd tactician. Look at things like Action 775, his wrestling Asmodel in the street, his taking on Hank Henshaw and Mongul when he hadn't even regained his full power, etc. In other words, Superman didn't need the New 52 to make him into a badass. Are you sure you read Superman before 2011?
2) Superman was also surrounded by people who loved and cared for him: the Kents, Lana Lang, Pete Ross, etc. By
your own logic, if Batman doesn't have anything to really mourn, neither does Superman. But of course, both of them do have a lot to mourn.
3) Bruce losing his parents is kind of a big deal. But its not
just their deaths that is the issue for Bruce. Its that he
witnessed their murders. They were killed
right in front of him. If he had been at home when they'd been mugged, its plausible he would have turned out differently.
4) There's a difference between being naïve and being optimistic. And there is nothing wrong with Superman being optimistic. That's the point of him. He's a beacon of hope in a dark, bleak world. It doesn't mean he can't comment on the world's darkness. Quite the opposite, he acknowledges it by fighting against it. He does not, however, let it drag him down into those depths and that is am internal struggle that's been showcased in a lot of his stories. For example, Action 775, which delivered this moment, something that is quintessentially Superman:
And that is why Pre-Flashpoint Superman was better than New 52 Superman. Pre-Flashpoint Superman fought for your hopes and dreams. New 52 Superman fought out of anger.
You haven't established how any of that paints him as "naïve"
Okay, and Pre-Flashpoint Superman
did that. A lot.