Interesting topic. Here are my thoughts. About the worst characters - Daniels, Tennessee and his wife - Faris.
I like Oram. The execution was awkward, but he was right about that the ship repairing is much important than the funeral of nameless captain. Oram also was written better than Daniels, and was some kind of Shaw's spiritual descendant. But the plot or maybe dumb (as always) suits forced Ridley to made the faceless Daniels mc. She has no personality and, tbh, the actor's play was weak and unconvincing. Tennessee - i'm in rage about this brainless "organism". He is annoying, he made a stupid things, he acts like a jerk. And of course - Faris. She is a cowardly dumb hysterical life form. She kill Karine, which a better character than F. And she can't kill neomorph. She also blew up the lander. What wrong with people, which sent her to this mission? Even Lambert looks better to compare with Faris.