To me Prometheus fits beyond my wildest dreams of what we might ever get, I think it's a misjudged masterpiece from an all time great director...but Covenant didn't go where I wanted the next chapter to go so it's a bitter thing. Romulus is a very well made movie and fun if you just go in wanting fun and don't care about recycling of ideas, there is one fun unique action scene. Alien3, Resurrection and the AVP movies...I ignore them pretty easily.
The tricky thing about Alien and maybe Empire Strikes back is they set this bar where it's like these are near perfect works of art but also fun pop cutlure sci fi/action/horror. The more times I watch Alien I have to put it next to 2001 and the Godfather more than sequel Aliens or Terminator or a good Star Wars movie, it's just flawless and the messages are more timely today than in 1979.
A lot of people (not saying you) understandably complain about all the sequels/prequels in big franchises not doing anything original and relying on recycling old ideas and nostalgia...but then also they rage against something impeccably well made like Prometheus not being exactly like the original so what do they want? To me if somebody really hates Romulus and really hates Prometheus they just do not want any sequels/prequels to anything because if both of those are poor quality (one being unique, the other a formula, both looking/sounding amazing) there's nothing that would please.