Did Like:
IV
*canyon behind Artoo and cliff-canyon overlooking Mos Eisley
*ring-around-the-toilet-bowl-planet-explosions
*2004 twin sunset, not 1997 version or 1993 version
*troopers and Dewbacks scouting the desert
*Millenium Falcon escaping from Mos Eisley
*Vader's red lightsaber as the blast doors are closing
*scout in the Yavin forest pointing at the Falcon as it approaches the Yavin Base
*X-Wings departing the Yavin Base over the trees
*added scene with Biggs before the big fight
*real people at the celebration
V
*no more transparent snowspeeder cockpits
*better looking Slave I following Falcon in the trash
*all the windows in Cloud City
*mixed feelings for the other added CGI outside Cloud City
VI
*absolutely nothing - IMO the original of ROTJ is the absolute best it could have been
Did Not Like:
IV
*new Sandcrawlers rolling across the desert
*Obi Wan's new house
*all the cartoon CGI at Mos Eisley, especially the droids punching eachother
*no more Wolfman in the Cantina
*Greedo shoots first
*1997 and 2004 scene with Jaba - both terrible CGI and waste of film time
*Han runs into an entire fleet of Stormtroopers
*blinking Dianoga in the trash compactor for 2004
*the Falcon flies to the side of the planet approaching Yavin IV, not under it
*all added X-Wing sequences except the initial departure from Yavin Base
V
*Wampa eating a bloody chicken-leg
*holo-Emperor-image AND voiceover dialog
*added snakes and reptiles on Dagobah
*Vader gets in his shuttle and flies to the Executor after his fight with Luke
VI
*the cartoon music video in Jaba's Palace
*Grandma Oola screaming
*the Sarlacc-Fly-Trap with radar/motion/sonar-detection-tentacles
*Obi-Wan's ghost is blindingly bright, like a "small moon"
*the removal of Anakin's eyebrows, the only piece of manhood he still had left
*the entire ending sequence, including Hayden, the music, the cartoon cities, the extra fireworks
*edit*
But hey, at least the scene in VI when Han gropes Leia after she gets shot is still there, so it's not all bad. Way to get her when she's down, Han, way to go.