I think they need to basically just do Superman as well.. Superman. The problem with handling characters like this is they try and "modernize" it too much and in the process wind up ruining the character. The new "metrosexual" superman from the last movie diaster was an attempt to make the character "relevent" in what the dicector/writer thought the real world was like. It was just pathetic in the overall effect it achieved.
The thing they have to remember is that Superman is bigger than life. Especially in starting a new franchise they also need to let him establish his credentials before they start introducing all of these obtuse human angles, constant challenges that are variations on "how will he overcome the Kryptonite this time", or running into things that are massively more powerful than he is. I think even the comics and cartoons fall prey to these problems, and it's part of why I think so many people think Superman kind of sucks especially nowadays. Not just because of his "boy scout" mentality, but because Superman seems to be getting his arse kicked almost 24/7. How powerful something that superman needs help to fight is kind of loses proportion if you don't actually have an appreciation for how powerful Superman is supposed to be. This makes it kind of out of sync in the rare occasions when he does his thing at his full, unopposed, level of power, and easily forgettable when buried among the rest of the junk.
I also think that Superman needs to be understood as a paragon of old school, very basic values. Believe it or not I think an old crossover, Superman with Gen-13 believe it or not, once defined the point of Superman in a few statements, one of the most important I believe is that "Superman is the one thing, you can always rely on". See, no matter how bad things get the point is that Superman always wins, he always saves the day, if he shows up everything is going to be okay. Sure he might get battered, bloody, power sapped, slammed into other dimensions, but in the end he wins, not just for himself, but for everyone, and when it's over everything is okay. I think that's the essence of the character, he's the anti-dark, the anti-angst, the guy that needs to exist for dark, angsty, overly human characters and stories to be compared to. Without guys like "Superman" on the flip side, guys like "Batman" have nothing to really be compared to as being differant. Writers, in all media, who try and make Superman Dark, Angsty, and overly human miss the point, as do those who decide to have him grappling with failure. You do that and he's just another Generation X inspired superhero without much in the way of identity.