So, when Episode III came out and Lucas thrust some dude called "General Greivous" in everbody's face, I'm pretty sure the entire theater let out a collective "WTF?" After suffering through the rest of the movie, though, I sort of got what George was trying to do. Basically he was like a prototype Darth Vader, right? He's supposed to cast our minds forward to the "mechanical man" we all know is coming.
Here's the thing, though. I said it then, and I'll say it again. Darth Maul was far and away the best thing about the Prequels. Hands down. And we got to see him for a grand total of...maybe 10 minutes of screen time? I'll admit, a precursor to Darth Vader is kind of a neat idea. But why was it necessary to invent a brand new character nobody's ever heard of and make him, Surprise!, the main antagonist in the Clone Wars? The perfect opportunity was staring you right in the face.
We saw Darth Maul get severed in half. We didn't see him die. Why not bring him back with a mechanical lower half and lend some additional continuity to the Prequels themselves while you're at it? See, Episode I was so long before Episode II it kind of feels like part of a different series or something. If you bring Darth Maul back it ties them together better.
I'm telling you, you could have made his mechanical lower half with like less highly-developed technology so that he looked all janky and awesome. Hell, why not give him spider legs or something while you're at it? Make him even more of a badass. Not to mention, that brings a level of personality to the Clone Wars that was sorely lacking. Suddenly in addition to the abstract political nature of the fight, the Separatists' main general Darth Maul and one of the Republic's main generals Obi-Wan Kenobi have a serious score to settle.
Well, long story short. Somebody's finally listening to me. Not that I care anymore.