Minus the Mos Eisley sequences and all those look-at-me I'm new droids and rontos, the SE of ANH has some decent sequences and brilliant color timing. I thought that some of the Death Star battle changes updated things relatively nicely as well as that Biggs scene. All the Millennium Falcon's sequences looked fantastic, so I was happy. My beef is mainly with the errors of the 2004 transfer, as well as Lucas's unwillingness to release the original.
As for ESB, I didn't mind most of the changes. Yes, the wampa is probably better left unseen, but the snow battle does look better. The Cloud City windows could have been nicer and grander, but, considering it was the 1990's, I can appreciate at the scope they were hinting at. Luke's scream does admittedly make me laugh. Didn't particularly like how the more vivid transfer revealed the theatrically-seen bluer Hoth. Despite the fact that it's not as intended, I like my Hoth white.
As for the ROTJ SE, THERE IS ABSOLUTELY NOTHING GOOD ABOUT IT, COMPLETELY RUINS THE EXPERIENCE...
hmm... this is my 666th post...