Countering your opponents' moves is an integral part of Netrunner, and one which is slightly harder for the Corporations. The Runner will have tools to disrupt the Corp in any number of ways; raising rez costs, trashing assets, milling cards, etc. By their nature as an attacking force, any time they attack you they are disrupting your plan.
The Corporations are a defensive force, and as such only have limited ways to disrupt the runner. ICE is the obvious one, and there are a lot of very powerful Operations suchlike. But almost all of these require the Runner to attack. There do exist very strong Corp counters; Sunset and Tenma Line completely counter Escher, but you will almost never see them played. This is because for all the decks that don't run Escher, those cards are useless. If a card is in your deck as a counter, it should either be good in its own right (Such as Jackson Howard countering Indexing), or it should affect almost everything (Enhanced Login Protocol will work against almost every runner, although it does not directly improve your ability to score agendas)
Cerebral Static is a card that many people look at and say 'It doesn't affect Andy, The Prof or Val, so it's a situational counter'. Technically true, but also very wrong. Against those three, yes, it's rubbish. Against everyone else in the game it is usable. It is also not dependent on game state, as with the exception of those three identities, Cerebral Static affects a card that is always in play and active.
Its effects are widely variable; at its worst it does literally nothing, but at its best, against Kit or Noise, it undercuts their entire deckbuilding effort. Against the vast majority of Runners it acts as a tax, costing them credits in several cases, or removing tools that they would otherwise use against you.
Tl;dr: Cerebral Static affects the game against almost every runner for almost every conceivable board state. It is really worth taking for a spin.