I thought some of the CGI looked crap when I saw 'em in '97 (Jabba, dewbacks, stormtroopers, stupid looking comedy robots, Cloud City buildings, Jabba's silly showtunes band, Sarlacc beak...). Some of that stuff I'm sure would look even worse today.
I haven't watched the Special Editions since the night I brought the DVD boxset home in 2004. I remember they changed the Jabba in ANH, but I don't remember being much more impressed with the looks of him and of course the scene still seemed wildly out of place.

To me, the SE's addition of crummy CGI gave the films a much more dated look than the original versions.