Originally posted by queeq
I think the PT had a bunch of talented actors (McGregor, Neeson, Lee, McDiarmid, Jackson, Oz)... it also requires a good, well crafted story and ditto script and a director who does not only have a vision for the final product (which Lucas certainly had) but also for a way to make that work with the actors, considering the amount of CGI (or the choice for a certain amount of CGI).
The PT had a great pool of actors, had decent acting, and a really great story. I think the acting is the area that could stand the most improvement from any Star Wars film. Some portions are great and some are not. A different group of people and a decent director may give us a better acting performance than the PT and OT.
Then again, maybe not. But, honestly, most people didn't watch the movies for their Oscar-levels of acting.