Well Riftblade Kelain is just kind of smug but Shadeweaver Zarra and Duskrunner Lorinas (especially Zarra) talk about embracing the void, feeding souls to the void and listening to the whispers.
We kind of see everyone among the Black Empire (and the twilight hammer before them) forces so i wouldn't take it as a absolute condemnation of the Void Elves as just being Void servants is disguise