There has never been a true commentary made. It takes fan projects like Garret Gilchrists fandmade commentary on the classic edition, or jambe's making of with commnetary to really appreciate the good audio interviews.
We got bits and pieces on that star wars cd rom, and on the definitive laserdisc. Some of the audio commentaries are used more than once or appear to be sourced from seperately taped interviews at different times.
Anything Lucas has said since the 1990's i don't give much credibility to.
The last time Lucas appeared to be truthful on the making of the films was during the making ofs and from star wars to jedi.
There was no lie at the time about the six saga story of darth vader, that vader was always luke's father and leia the sister, as far as i know i have not seen the making ofs in some years so i could be wrong.
The fact that they could not get Harrison Ford and Mark Hamill for the commentary would be dissapointing if you did not know they repeat the same stories verbatim and so does carrie fisher.
These days they don't have much interesting to say about the films.
I would have liked a director's commentary over the original films if they were restored.
I would actually prefer a commentary on star wars 77 by Gary Kurtz than Lucas because he would actually talk about how the film was actually made.
Kershner on Empire to be able to talk loosely on the making of empire without Lucas looking over his shoulder.
And a commentary by Kasden on empire and jedi. I would also like a richard marquand commentary but sadly he is dead. Which did'nt stop lucas from altering a film he did not direct.
A star wars mega set would be great if the extras were put together like the lord of the rings extended editions. Seperate commentaries for all the different people who made the films.
Lucas on the other hand likes to talk about the detail they put into jango's suit in the attack of the clones commentary,lol.
When he used to say the sets and the effects were less important than the plot.