It's one of the cases where the movie is carried hard by one single performance. Although I do like Covenant more than most, Michael Fassbender is the biggest reason. He plays 2 androids who are very different from each other and there isn't a single weak moment from hum. It's like Fassbender was a huge fan of the Alien series and was just so glad to be in Alien movies.

Walter is your regular good robot but Michael uses great voice control and minimal eye movements to sell his performance as a robot. David is deliciously evil and quoting poems left & right with gravitas. Michael is having a hell of a time as David. In Prometheus he was still kept in rein but in Covenant David is let lose and what a menace he becomes.

My favortie 2 scenes from him are:

1. When he releases the black goo over the alien race world and quotes Ozymandias, that is a pure chill inducing moment.

2. It's a very short scene but shows what a talent Fassbender is. He utters the line at the very end: "don't let the bedbugs bite" as he puts to cryosleep one of the crew members. That delivery & expressions along with the realization of what actually happened at the end is magnificently pulled off.

I would like to see a sequel to Covenant just for more Fassbender as David.