The fauley track being mixed correctly in 5.1 but solely the musical score has it's audio flipped on the two rear speakers, something that especially bothers enthusiasts of classical music, because they kind of developed an ear for such things. A classical music orchestra has it's instruments arranged in a certain manner, destroying this arrangement means destroying the deeper harmony and beauty of the music.
The second flaw is, that Ben Burtt obviously did not have the time or the resources to reconstruct the audio for ANH entirely, as a lot of small things are amiss (certain sound effects are either different or completely gone, thus reducing the depth of the soundscape - it's basically damaging "the film off the screen" as Ben Burtt called it once himself).
Another thing is the mix itself. The loudness of the fauley track in relation to the loudness of dialogue and musical score is weighted totally different than in the original mix, which surely could be interpreted in some places as kind of a 'creative decision', but in many places it just sounds like a bad misweighing of the different audio streams' loudness.
In my opinion Ben Burtt was not given the time and resources to complete his work - let us just hope he'll return for the job for the 2007 DVD set to complete his work.
The irony is that George Lucas is the one making the biggest fuss about being unhappy releasing inferior or unfinished films to the wider public (namely the original trilogy), yet allows a release of such an inferior and most certainly unfinished work in the 2004 DVD set. My opinion is: If he had no problem releasing that 2004 version, he should have even less problems with releasing the original cuts.