Just read Bill Hunt's review.

I must say it is quite fair. He points out obvious flaws (edge enhancement Ep I, screwy blurry encoding EP VI, meager HD resolution scans of all six), he expresses his opinion about Lucas's changes (same as ours, only not so hysterical), and underlines that not EVERYTHING was fixed (garbage mattes, saber colors, etc).

Now, given our expectations of nothing less than perfection, his B+ seems high, but given that the way he rates blu-rays is in comparison with all other blu-rays, the B+ seems right in line. He doesn't artificially raise the expectation bar simply because it is Star Wars, which we all seem to think "should" be absolutely dead-on perfect.