It looked like a freaky porno with unlikeable characters.
That's redundant. Only vanilla shit has likeable characters. The freaky stuff has has an undercurrent--if not a plainly visible overcurrent--of sadomasochistic elements, necessitating a facade of abuse and transgression between the players.
Not that it really matters, because without genuine pathos and emotional honesty--which so few works have to begin with--likeable characters are overwhelmingly pasteurized grey paste in humanoid form meant to cater to the middlebrow sentiment of oral fixaters clamped to the teat of polite non-confrontation.
That said, Prometheus
is a wonder. I love that it had the balls to pull the cruel bait and switch, transitioning from grand quest for enlightenment, search for God, discovery of the origins of humanity and all that overplayed, weepy crap to a straight-up nosedive into body-horror pulp shlock. It was an absolute joy watching all the hope and purpose drain from the characters lives as they plunged head in onto maddening incomprehensibility. I'm a bit wary of any sequels attempting to answer the lingering questions; it's more fun not to know.
"Now, from Nature we obtain abundant information about ourselves, and precious little about others. About the woman you clasp in your arms, can you say with certainty that she does not feign pleasure? About the woman you mistreat, are you quite sure that from abuse she does not derive some obscure and lascivious satisfaction? Let us confine ourselves to simple evidence: through thoughtfulness, gentleness, concern for the feelings of others we saddle our own pleasure with restrictions, and make this sacrifice to obtain a doubtful result." -The Divine Marquis
"I agree Hans, but we have talked about those anal fisting analogies." -Werner Herzog