No...NO! Blue on Blue only. It shows: their equality, the premise of one jedi turning on another, and it looks good with the lava.
And I disagree. keep Grievous, just allow him to fight a bit more and be a general...and make him more wild, more agressive. Did you read the book? He punches his fist through a Neimodians skull. THAT is the Grievous that I want to see. It be good to get some more Magna gaurd action too.
I agree on the droid voices...they sounded horible, especially the SBDs.
And I thought killing off Dooku was fine the way it was. If Lucas was never going to go into his political talent in the films then he really is a minor character and was quite dispensible.