Recently I wanted to test out my list against the fabled ScreamerStar. I found a Deamon Player willing to run me through the ropes. I wasn't really sure what I was getting myself into, but I planned on seeing it through and doing the best I could.
It took my entire armies shooting but I just killed the last Hound turn 1, netting me first blood, and a safety from assault for this turn. He Cast up on his screamers and moved them towards me. I got super lucky and Deny the witched his shooting spells on my forward marines. In retrospect he should have just turbo boost up to my face, but he had the distance next turn regardless. I managed to hit and ground fateweaver with a pot shot from my riptide who was able to move sideways to gain LoS. 4 Sniper drones were then able to single shot at him, all hit, all wound, and he fails all saves.
People are saying D weapons are there to balance out things like ScreamerStar. While I agree it would help lessen their prevalence, the damage it would do against most other armies is also terrifying. Even in a kill point game, you have a chance against screamer star, you just really have to play the mission.