Well, I have to admit, I prefer "Some" of the changes in the OT, mostly those nice cityscape and views, and some extra lifeforms in the background, and addition to some space battles.
Contrary to some, I do like the recolored 'sabers. But other than that there are only a few changes appeal to me. And yes the DVD RtoJ ending might not be bad, though I wish they kept most of the original ending also, and seriously, the JubJub song is better than the "Weza Free" thingy.
As for the bad things, I really don't want to start a frame war... Greedo...