What do you guys want, exactly, when you say "darker"? Halo can't get all that realistic. Aliens die, your fellow soldiers die, occasionally a main character bites it, what more can you do? You want the kind of realism described in the books? Brutes slashing heads off civilian children? Or maybe marines screaming out for their mothers while half their torso melts away from a plasma burn? Someone offer up some ideas besides saying "I want it darker and more realistic." The Halo games are already rated M, anyways. Adding any darker elements would be sure to garner the attention of anti-videogame critics, and stuff up a lot of unneeded fuss.