I was too late for the Vihris / V5 debate to have any notion of going through the arguments again, but I would like to just touch on something that Vihris said.
I also like Sleep, Electric Wizard and Orange Goblin (particularly the latter two). I wouldn't say that they have a lack of talent (check out much of the OG drumming, for instance), but I think you mean that they don't seem to compose particularly complicated or technical music. That may be the case, but sometimes the most talented metal composer knows that the riff is fucking kind. I don't need no steenkin' polyrhythms while I'm waggling my flares about, hombre.