Bester said:

TheBoost said:

...a huge ammount of model work, puppets, masks, etc.

Not enough, in most people's opinion. The extensive use of CGI in the PT gave a cartoon-y feel, especially in the space battle sequences (the opening shot of Ep3 springs to mind). It's hard to argue with that assessment.

I don't think it was the CG that made the opening shot of RotS seem cartoony. I think it was the cartoon mickey mouse robots making cutesy noises and prancing across the wings of the fighters that made it seem like a cartoon.