If someone uses the phrase "DVD Quality Video" in their marketing literature it usually means one of three things; (1) their product is crap, (2) they haven't the slightest clue about DVD-Video standards, or (3) they do understand the standards and are simply trying to mislead you...and their product is crap.
Now maybe I'm being a bit harsh here, but I take offense when companies attempt to mislead the "typical" consumer by using generalizations. The fact of the matter is that there are several standards for DVD-Video, along with other variables that can impact DVD-Video picture quality.