I'm not sure what to think of this. Looks like a lot of action towards the end, but an awful lot of brooding and bad feelings to kick things off (and they don't seem to get much better). This feels like the Superman version of "Dark Knight" where the writer just makes the world ugly and seedy and the hero has complex and conflicting morals, so that even when the hero saves the day everyone still feels like crap. I feel like that's been done so many times already and its kind of depressing at this point. Definitely maps to what I hear about the new 52 books and probably more interesting than campier early versions of Supes, but I can't help but feel like we've been there, done that.
As for copying Marvel, that was always the big difference for me between the two universes: DC Heroes were mostly in the limelight, loved by their adoring public, while Marvel heroes (even the Avengers) were often battling the public and government as much as they were super baddies. Now we (shockingly) have the grand daddy of DC Superheroes seemingly in a world where he isn't appreciated, but persecuted instead. Again, just feels like kind of a sell out, copycat storyline from that trailer.
I do hope they follow Marvel's gameplan of individual movies leading up to the Justice League though. I don't care about modeling that format - it's a great way to get the background stuff out of the way, so the team movie can focus on a bigger story and more action.