I ship David and Shaw, probably as a minority of one on this board. Ridley Scott already fucked it up in Covenant by butchering Lisbeth offscreen, very disrespectful, and not giving her and David more screentime. I really liked Elisabeth as a character and wanted her to be happy, and the movies falsely lead the audience in that direction with the foreshadowed space adventures.

Basically what this blogpost says.
https://alien-covenant.com/topic/44083

Aside from that, most people are concerned about stupid writing or the story going in weird directions but everything has already been overstated, I don't know what to add to that. The David AI arc was very interesting and Fassbender carried both films almost, especially Covenant.