A card that works well with many criminal directions, and a card that helps illustrate the strategy criminal’s sometimes follow: A successful criminal doesn’t need breakers. Emergency shutdown can be a brutal economic hit to a corp, especially when following Account Siphon. In combination with a lot of the other HQ focused cards that Criminal possess, it is not hard to make use of it.
It is always going to cost the corp something when this card is used, but the problem may become that it may only cost a few credits. Some corp archetypes have very cheap ICE and that is possibly why Emergency Shutdown hasn’t seen a solid spotlight. Not that it hasn’t been seen - It certainly works well, especially with ICE like Tollbooth being extremely popular.