The 2004 DVD's are a disappointment to say the least, and the 2006 GOUT discs, while they look 'alright' on a standard 4:3 TV, are an insult not only to the fans but also to the achievements of Lucas himself and ILM.
However, my SW prequel DVD's, Willow, and Indiana Jones trilogy all look and sound great. So yeah, I wouldn't say that they simply don't care about about quality.
However, I would like to hear any excuses that Lucasfilm has as to why the 2004 SE set isn't up to par since, after all, those DVD's are supposed to be the best representation of those films available. I'm sure SOMEBODY at LFL had to have noticed that something wasn't quite right. I was excited when I heard that it was being restored, and that some of the SE additions (like that funky 1997 CG Jabba) were being redone or tweaked, but now I wish they would have just released the 97 SE masters as they were and just left everything alone.