I did like how they attempted to clean up some of the original effects. Too bad the matte lines were still there on a lot of space shots and some of the snowspeeder cockpits were still transparent.
The Falcon blasting out of Docking bay 94 was something I enjoyed. The new sandcrawler footage was cool too.
I liked seeing a bit more of the Slave 1 in Empire.
And I was thrilled to hear no more of the 'yub-nub' song in Jedi. The end of the coolest movies ever and we get singing teddy bears. I've always hated that.
The rest of the changes were either a distraction or just different (and therefore unnecessary) from the original.