Wow, loads of reviews of Sacrificial Construct! I'm actually running it at the moment in a janky but reasonably successful deck, so there's a couple of things I think I can add.
Lynx Kurenko mentions SacCon's utility as double resource fodder in Hayley. I think that observation should go hand in hand with a mention of the fact that Aesop's Pawnshop drastically reduces the opportunity cost of playing such fodder cards. Don't need SacCon this game? No problem. It's an Easy Mark.
I'm not a big fan of using this to recur Faerie. In that case the same influence and slot could be used for Mimic, which supports Faerie really well on a permanent basis. I also agree that it's no replacement for Sharpshooter given the number of commonly played multi sub destroyers. But if you've got it in your deck, then sometimes it will be better than either of those cards all on its own. If you're playing against Blue Sun: Powering the Future for instance, you can use this to face check without fear of Nebula, Grim or even a sneaky Wormhole piggybacking a trash routine from somewhere else. That's not nothing.
Against Power Shutdown it's fine, but then practically anything cheap and disposable does that job. Shapers commonly have Clone Chips and SModCodes lying around, so they have some natural protection anyway (although if you do get a SacCon out, you don't hate protecting those options). Protecting Clot is obviously good, but again Clone Chips do that job for you without you having to slot a card purely for that purpose. One argument in favour of SacCon for Clot is the timing of the Corp's turn. Because they choose the order of simultaneous effects they can trash an installed Cyberdex Virus Suite to create a window for scoring fast advanced agendas that beats a clone chipped clot. In the same situation, SacCon offers no such window.
I think the card that really makes SacCon worth considering right now is Marcus bloody Batty (that's his technical name). He's common at the moment and he will ruin your day in a way that no breaker can answer. SacCon counters one of his strong options, and for that I am profoundly grateful to it.
Overall, I think SacCon is good enough as a marginal utility/silver bullet card in a deck that's mostly planning to sell it to Aesop's a solid 60% of the time.