I remember I saw that Clone Wars trailer when it premiered in Los Angeles at Celebration IV last year. Seth Green was sitting in front of me geeking out. I have to admit, I geeked out too. But a lot of it is seeing those scenes with John Williams music! The Clone Wars miniseries on cartoon network stopped being superb when it had cheap synth generic music (the miniseries was still amazing though).
Another thing about the CG I'm not a fan of is that it... looks like CG. Plo Koon looks like he's walking on air. The character designs are very ugly too. But at least we have C-3PO as an original voice I suppose.
I still look forward to seeing it but I hope with it being released theatrically, I hope they do all they can to really beef up the quality of the visuals.