The problem with Cyber Threat (and most Anarch things, it feels like), is that it's a punishment card. Unless you've set up a situation very carefully (Reina and possibly Rook and/or Xanadu, say) then the Corp can choose what hurts it least. If I could choose to run after they rezzed a Quandary with my Yog in play, without letting them rez one of the other Ice in the server, I'd love it.
Overall, this was a really good Set Review, I think, mediohxcore!
You mentioned not seeing how the NBN Scorch worked, but mostly it works to slow the runner down and let them stumble into losing. They have to take the time to install a Plascrete or two, letting the AstroTrain get rolling -- and it's easy to set them up to lose on Midseasons with an NAPD Contract. It might lose out on other cards it wants, but the ability to pick up incidental wins off of the Scorch (and/or Fast Track/Psychographics(/Beale) out once they're all tagged up anyway) helps the deck pretty substantially.
Taurus takes out other good ice, most likely, but provides the chance to pay 6 to kill all the dang Plascretes, which is incredibly useful. It's much better for these purposes than Flare, I'd say, even if it's not doing meat damage itself, because the 'Crete can be killed even if I lose the trace, so long as they can't break the subroutine entirely. A lot of people don't bother clearing the tags once they have 'Crete out, (to be fair, doing so can be a major slowdown,) so Taurus opens up a lot of potential to surprise and ruin their day.
All that said, as much as I like Taurus I'd never run more than one (or maaaybe two, in-faction). You want to see one of them, seeing two of them is going to be far worse than seeing a second Grim.