I don't think anybody really expected the remakes to be as good as the original trilogy. He would have to recast everyone and completely reshoot the movie to do that. And even then, you'd have the people who can't deal with change and don't have any sort of imagination(*ahem, Dylan*) complaining that he completely ruined the movies. I agree with ANTLink19 when he says that Lucas is just fine-tuning the movies to meet his standards. Personally, I'd love to see him completely reshoot the movies from scratch, but that won't happen. And you can't say that Han shot first if you still hold George Lucas as the creator of the star wars universe. He said han shot second, so he did, he also said that boba fett died in the pit of carkoon, so he did. This only sounds like I'm suckin up when you make a big fuss about it, it's the people who can't let things go that turn everything sour.
On changing Obi-Wan to McGregor, that would be stupid, as we saw him live and die as Alec Guiness(or whatever his name is) during the movie, it only makes sense that he'd still be Alec Guiness. However, they changed Vader because he had returned from the Dark Side and he wanted to make that impression by casting Mr. Shaw, and so that we knew what Anikin really looked like. Another reason he probably kept Alec as Obi-Wan is because the actor himself is dead, it wouldn't really do to take away his work, ya know?(keep in mind, i don't know the state of Shaw, i didn't know the actor's name until dylan said it). Putting Hayden in there could also be showing George's respect for him as an actor, and so that maybe people would get used to him as really being Vader. How can you upbraid Anikin for being a "wuss" when you cry during movies and "oh" and "ah" at "purdy" images, Dylan? You've got absolutely no room to talk. Solo and Fett DO battle on the sand skiff or whatever above the pit. It isn't much, but it's there.
The originals were originals, DURING IT'S TIME(I'm emphasizing, not yelling, by the way). Of course it's going to look like every other sci-fi movie made now, how many new techniques can you invent? We're at the apex of television technology, now we've got to start work on holographic technology and that sort of thing