That's the problem. He's Superman, he doesn't need to be tackled in a realistic/modern context. He's freaking superman, he flies around, wears a cape, invents powers on the go. There's no reason for Superman to look any darker unless there's a plot twist I'm not aware of. Older or more muscular maybe, but darker? Leave that to Batman. Superman is supposed to be a light in which we can all believe in versus a guy like Batman, who uses his uniform and gadgets to inspire fear into those he fights. Superman doesn't need to do that, he doesn't need to operate in the shadows, everyone knows who he is because he's the protector of metropolis. I'll never dig the "darkness"
Well that's understandable but the mistake you make is that you underestimate the potential of the character's adaptability, you seem to prefer 'happy simple hyperstylized American dream' Supes(which is fine) but I feel that the character can certainly go to serious/realistic realms but still maintain his essence of who he is, hell the comics have entered some pretty damn serious realms before I might add, and there are many different ways to do the character and . I feel that if you want Supes to resonate with a modern audience naturally going darker is the way to go. That does not mean, however; darker is naturally better but if you do right enough level for the character it can work wonders, besides its not like the spirit of Supes character is allergic to that kind of thing, in fact even in the original comics have tackled a lot of grim stuff and realistic stuff like suicide, child abuse and murder and war.
I mean this guy won't be emo or anything, this one clearly looks like he has somethings to figure out but I see that as a natural evolution of the character in this age. The fact that this film gets to go a more serious route then before is truly a testament to how good this character is, and if he's really 'lightness' or hope then maybe this movies realistic\modern world should test that inherent goodness Supes has and make you resonate with him, and get a feel for the guy. I mean he isn't really this savior Jesus messiah as imagined, he isn't perfect so despite him coming from another planet he's still very human at heart, he's still the simple farm boy.
I expect this film to just delve deep into how Clark became Superman, like him being that simple farm boy that was denied a normal life because of his heritage, maybe bring the idea that him having these powers makes him feel like an outcast, or that it attracts trouble to the world. I'd say its looking to to be a more interesting take on the character than the benevolent gentle messiah figure Reeves/Routh commonly portray him as and gets him back to his roots as this tough intimidating champion of good, at least that's what it looks like.
–- Update From New Post Merge ---
I gotta say I like the hair alot, it makes him look more wild and vastly different from anything we've seen before I'm so glad the filmakes are getting away from the shadow of Reeves and doing their own thing.
Now I wonder who'll play Luthor(if he's even in this)