Viciousness over logic

Rating: 6/10 (12 May 2017)

A small spoiler...
David commandeers the ship to the alien world, while learning about the engineers. As he arrives, we see just a small town, or a village more like, of aliens that look evidently different from the engineers we saw in the Prometheus, also primitive, cheap and scrappy. So, before even making any acquaintance, David decides to take them out of their misery, by flushing most of the goo supply upon their heads, turning the valley into some sort of a tar holocaust.
It is an original idea, to suggest that a civilization at its peak would become a small filthy scrap yard under a rock, with a few hermits, no signs of technology anywhere, except for interstellar spaceships and ample supply of super-vicious goo stuff, aka bio-super- virus that mutates all life forms into combustible monster breeders.
So, after the greeting party, David also kills Shaw, and sets up a lab on this newly found rock, to start developing even more vicious stuff, so on the off-chance someone flies by, he can kill them even in a more elaborate way.
I mean, all is making sense up to this point - right? Enough of the spoiler stuff though.
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For anyone who expected a logical continuation to the Prometheus, forget it, it is a continuation without any logic.
An interesting story cannot be predictable, but there is nothing interesting in a story that simply turns chaotic.
They could start and end it with one line - "basically, everybody dies", and leave it at that. There is hardly anymore merit to the story, it is dark, vicious and terminal. And it leaves the taste of an over-the-top, vampire movie.
For the Sci-Fi genre, it is a failure, as it provides no logical answer to any of the interesting questions raised by the Prometheus.
Nothing what you see there will make any sense to you, sadly.