These changes I don't mind:
-The ring around the deathstar
-The new Jawa Sandcrawler
-The new ObiWan Hut
-The expansion of MosEisley without the stupid jawa swinging and making sounds
-The new detailed X-Wings leaving Yavin
-Some new shots in the attack on the death star
Thats it, ESB & ROTJ should have been left alone. Originally Lucas was only going to do Star Wars, he even says it on the laserdisk, but he figured why not make money on all 3 in the theaters? Lucas couldn't do certain things in 1977, and by changing little stuff like this, I wouldn't be complaining of no O-OT.
But of course, he sticks in a bad CG Jabba, changes the Greedo/Han scene, puts in an awful new song in Jabbas Palace, and then puts in Hayden in ROTJ!!!!!!! All changes that had nothing to do with technology back then, just Lucas going crazy trying to change more than he needs.