I don't really have a problem with the rest of the costume for Diggle, but if indeed he is the Guardian why not go with the original helmet design from the comics.? I like the idea of the black color, it makes sense since Oliver Queen and company are definitely stealth mode type street level crime fighters. I also understand that for an actor you want as much of your face visible as possible. It makes playing your intentions and reactions a lot easier. But this helmet design looks way to much like Magneto's helmet. It doesn't have to be gold, but the original Guardian helmet looked a lot better and made more sense from a tactical point of view. It covers half his face, but so does Batman's cowl. If the Bat can act through it, I'm sure Diggle can too.