Some of the changes I enjoyed, others were bad ideas (Greedo shooting first);
I don't really mind the CGI, there are certain parts of the first film where I think they could've done some better work other than throwing in animated dewbacks (The scene on the Falcon where look is training with the remote, the lightsaber effect looks like shit).
The Emperor bit in Empire; I'll take Ian McDiarmid there, as long as they kept the original dialog in. I just love the way they said it, that "search your feelings Lord Vader" reminded me too much of the prquels, and that isn't a good thing.
And Hayden Christiansen in Jedi = (N) . Bad idea, George.
Redubbing was just awful, too. I love the stone cold way Boba Fett spoke. I don't care if he's a clone of Jango, he's a different person. Let's give him some identity!