CO said:

T2 and The Abyss are perfect movies where CGI makes them better, but does not overtake the movie.

The Prequels are loaded with CG and just looks like an animated movie (Episode I isn't that bad as that actually has real environments) Episode II & III are just animated movies with real life characters and wont age well 20 years from now.

Who ever complained Mary Poppins had matte-work overtaking the movie? Does the fact the penguins are plainly 2D animated pen-and-ink figures date that movie terribly? Do the obviously stop-motion skeletons in Jason and the Argonauts overtake the movie? Or is this simply anti-CG bias.

Acting as if the opening minutes of Ep. III aren't simply spectacular use of CGI, and that the Mustafar duel isn't a breathtaking accomplishment is just denying the overwhelming quality of the work.

If we're under the impression that the special effects in the OT have aged with amazing grace, take a look at the nits being picked in the fan-edit forum. And that's some of the best work with models, matte-paintings, puppets, and stop motion ever done. Take a gander at the middle of the pack special effects from 20-30 years ago.