I thought she did a fine job, I dont agree with the reviews that I read. If I was going to critique anyone's acting it would be Carrie Fisher's. I have only seen it once, ill see it again this week sometime. Right now I would say its easily the 2nd best Star Wars movie and I dont think that it is really that far off from being number one.
I was beginning to wonder if you'd ever see it.
It's second on my list too, behind Empire.
I found it was even better on my second and third viewings, as you aren't mesmerised by the fact you're watching Star Wars, and you notice a lot more of the little things.