2) Some are excessive but okay.
3) Some are just too much and distracting.
4) Some are horrible.
Examples of each:
1) The lightsaber fixes, removing of matte lines, addition of dewbacks, and opening Could City's landscape, adding the correct Palps to ESB.
2) I think that Hayden at the end of ROTJ falls into category two. I think it doesn't NEED to be there. Having the old man didn't hurt the film, but I can justify it in my mind, just fine. The wampa scenes in ESB don't help the film, but they don't really hurt it either.
3) The tentacled sarlaac pit. ...it doesn't really change anything, but it looks kind of fake to me. ...and stupid crap like burping frogs and robots hitting each other in transition scenes.
4) Hmm...the CGI Jabba is pretty bad, and the Greedo scene is abysmal, but the worst of all of the edits is the musical number in Jedi....awful....just horrible. It gives me chills up my spine, because it's so out of place, not to mention that he has every character stop and look into the camera. ...and everyone looks like a cartoon.