Honestly Prometheus (the first half) was really good, I enjoyed the parts that had nothing to do with Aliens. The rest of those movies are a jumbled mess that, while somewhat enjoyable, make basically no sense.

OK the black goo was used to create the Xenomorphs, it was made by the engineers who were almost all killed in that one flashback, they were the genesis of life on earth and.... Idk it just kinda all falls flat for me. I think the aliens are cooler when you don't know the giant half-human-half-alien starfish had to mouth-impregnate an engineer and some rogue robot was the reason basically any of the aliens exist.