It is a semi-prequel to alien and that makes it terrible. The scary part of Alien is that they stumbled upon something out in space that's been there for thousands of years, completely unrelated to humanity, they didn't understand it but it could wipe them out. So what other horrors are out there waiting for us to accidentally find them as we explore space? Promteheus made it: oh it was humanity's creators all along and they were coming to earth, oh and an earth made android adjusted their bioweapon to create the xenos. Now it's all connected to humans, none of it was actually mysterious and nothing is alien.