One of the most interesting and gutwrenching cards to come out in a while, Scorched Earth in asset form and a real ticking time bomb. My inner sadist already loves this card.
While seemingly overpowered, giving 4 meat damage for a measly 1 credit and click, without the need for an agenda to have been stolen or a tag, there are a couple of facts which balance it out. First off, unless the runner has a lower hand size or managed to not draw up during their previous turn, this can never be a kill by itself and will need additional support. Secondly, it has a pretty hard counter in the form of Political Operative, a card at 1 influence and answer to lots of corp cards. And thirdly, the runner will always have 2 turns to run and trash it after it is rezzed. This sense of urgency will create tense and dare I say fun situations where runners will have to be on their toes and think about whether they can afford to go into an expensive server to trash it, or whether they will have to brace for impact.
It has the potential to be meta defining and maybe it will prove too broken. But right now think it will give rise to even more tense games, which I love in Netrunner.