Others bitch about preserving film for future generations.
Even more grip about the changes being silly, or that Lucas has lost his vision.
Regarding the Original Trilogy, I think most people would accept the changes without complaint if all the flaws were fixed. Such a large amount of time an expense has been put into these new releases that it doesn't really make sense to have the small problems remain. If you are going to redo things like Mos Eisley or the X-Wings, why not fix the lightsaber in the Falcon? If you are going to add dialogue, why not adjust the scene where Vader voicelessly motions to Tarkin? If you are going to put Jabba in, do it right. If you are going to remix the sound, do it well. If you are going to fix the tractor beam display, change the numbers on the countdown to Yavin display. If you fix the reverse image at the end of Empire, fix the reverse images in the Yavin control room with Threepio. If you are going to improve the lightsabers, at least make them look the same from shot to shot. If you want to add the Emprorer, make him look like the Emporer.
Above all we want these films to fit together...all six of them. Change what you will, but be consistent...it won't take that much more.
With respect to the Prequel Trilogy, perhaps George hasn't lost his vision. Both trilogies make fun of body noises, (burping in the 80's is what farting is today). Directorally speaking, George is the same director he was in Star Wars, THX, and AG. He isn't so revolutionary becaue everyone has copied his style that HIS style isn't original or new anymore. Its almost thirty years since the revolution. The revolutionaries are normal now. That IS the standard. His vision is reality, and serves to inspire the new generation of filmmakers such as Larry and Andy and PJ. Don't you think?
I think I speak for all the fans when I say we desire consistency.