Let me put it this way, when each book dropped, people immediately figured out most of the "power" units in each (Daemons did take a while to suss out, so there's hope yet, I guess). Ravenwing, Heldrake, Riptide/Missilesides, Wave Serpent/Jetbikes, Gravguns/White Scars. All of those things, experienced players looked at and said, "Holy [big bad swear word]! That unit/army is Awesome!" What is the consensus "Holy [big bad swear word]!" unit of the Nid dex?
*crickets*
Again, I think we might be missing something, and given time, something strong might emerge, but I just don't see much to be excited about.