Anakin stamps all over that dividing line, of course. And there are conflicts between the various good guys - The Jedi often disagree between themselves and with the Senate. Some of the bad guys aren't out-and-out moustache-twirling villains - Watto and Jango Fett are both a bit more nuanced than that.

I don't think the need for a 'scoundrel' is about needing shades of grey so much as needing the humour - hence my comment about characters needing to lighten up and add in a few more wisecracks. It doesn't need to be at Joss Whedon levels. The banter between Obi-Wan and Anakin in the first reel of Episode III was good. More of that would have been nice.