Does THX Certified DVDs mean good quality video?

[Smokey]

The only "truer" comparison that I was ever able to make was with the non-THX and THX edition of Terminator 2 on laserdisc. The video was improved on the THX disc on the color quality, in particular green grass which looked like green grass on the THX version but had a bluish cast on the non-THX version.

From your post it seem that THX might have done a better job back in the 90’s with laser discs than with current DVD technology where it seem to be just a rubber stamp.

As I recall from 90’s, T2 was indeed the reference disc to showcase a system visually and sonically. But the THX T2 DVD is far (at least visually) from being called a reference disc.