They used to cost like 20 AIP, they've got to be more useful now than they were then. But it's certainly possible that they need more work.
And Penetrators may eclipse them in much the same way that Martyrs eclipse everything (ed: patched that, we hope), but it's entirely expected that some of the stuff in the "super weapon" minor factions (golems, spirecraft, fallen spire) will totally out-do stuff in the core game: either you're paying an arm and a leg for them, have specifically said "make the game easier" (by picking the easy version), or are getting hit by exos as "compensation".