I was never a fan of the Prometheus direction from day one it was announced. That's when I started to feel cheated.
Part of what I always considered Alien to be great at is mystery and taking care for each movie to tell the story it needed.
I also remember loving how the movie uplifted itself and the Sci Fi elements sounding like a B Cheesy movie but actually ending up in the league of an A masterpiece. I even think the second and third one can be contenders to that categories.
Prometheus since day one showed that it was an A movie that tried to dumb down everything it could and most of all, kill every mysteries in Alien (Covenant followed that rules too).
I'm personally not in favor of the Creationist / Heliocentric / Self-Centered engineer story which is millions of light years beneath extraterestrial life theories of nowadays (just hear NASA and ESA speaks of Enceladus, Europa and how our own galaxy is a home that has just in a 2000 light years radius around Sol so many candidates in the habitable zone to have life and who knows what other things we know nothing of now?) It feels quite empty and really not dangerous at all which is probably what bother me the most with the Alien now and how I feel cheated, it's just a bit monster with claws that was created in a lab from pre-existing common species.
What strike me most is the uninspired non original way the licence has now taken. It's following the AVP Formula where the creature is a pretext to make an action / horror movie because very little material from the franchise it tried to establish remains. It's like taking Star Wars on earth nowadays and the only link would be because you have a jedi having a light-saber working with Iron Man who then explains that Luke Offspring populated every galaxies in the cosmos and so we are all children of Luke and it took them a long time and they are from a far distant galaxy (dafuq right?)
What surprises me most about Covenant is how this sequel to Prometheus is a 180° from it.