The opening sequence lost me. You know, the one where some guy with too much electrolysis walks around in a robe and loin cloth. Whose DNA turns out to look like a ladder, although space-filling models and their two-dimensional images show rather clearly that DNA is not really ladder shaped.
I still hung on but when the archaeologist used her miniaturized instant archaeological ruins dater to announce within minutes that the cave was over 35 000 yrs old, my willing suspension of disbelief wasn't just a horse put down for a broken leg, it was a pot of glue. Maybe I missed something but it was completely unwatchable for in-your-face idiocy.
Your suspension of disbelief doesn't sound very willing. I'd stick with documentaries if I were you. There were much more distressing things about Prometheus.