Ugh. As much as I wanted at least one followup to SR, I don't really have a problem with a fresh start. But "dark and brooding"? Isn't that the complaint most people already had with SR?
It's hard to get any darker than Superman getting the crap kicked out of him, watching him crawl through the muck, and then seeing him get stabbed in the back with kryptonite as he yells out in pain! Hell, I still find that scene in SR to be more powerful and disturbing than anything I saw in TDK.
If they want to give people a Superman movie they want to see, just make it light and fun and action-packed like Iron Man. It's not that hard to figure out.
(oops, looks like Captaindemotion beat me to it)