Did I miss something? When did we control anything beside a simple voidwalker?
Also while irt is true that a lot of info on void lords is fans trying to salvage the trainwreck Blizzard made, there are two things that are pretty clear from Chronicle.
1. Actual void lords are so scary it made Sargearas decide that destroying all life is a better alternative to even give a chance of void lords getting their hands on a planet.
2. Void lords can't really come over to us so they use Old Gods and other summoned creatures to do their work while they stay in heir own dimension.
So no, we have never seen an actual void lord. As the shadow priest artifact confirms.