The DVs are a series of Guild dreads that are indeed sought after, and there's a ton of love for them here on the board. Guild is notorious for making model names that aren't mappable to anything, Cheab, but I recall someone proposing that DV was for dreadnought vintage. I wouldn't ascribe very much to that in terms of intent of the diffferent members of the series.
DV-52s are non-fancy appointed guitars. They came in hand-rubbed finishes, as well as satin NCL. But, they also came in gloss NCL, so (again) don't expect consistency. A DV-52NT would be a natural top (as in no stain / sunburst), but I don't know if that would be hand-rubbed, satin, or gloss finish.
DV-7x are quite the opposite. They have very fancy inlays, some with turquoise, some with malachite, and some others as well.
Anyway, as for why they are sought after... I have heard many here say they like the tone of the DVs better than the rest. In some sense, by analogy, it might be like comparing Martin's HDs to their Ds. The bracing is different than the other dreads, and that may be true here with the DVs.