Flawed due to Fox compromise and script writer John Logan

Rating: 5/10 (5 June 2017)

Ridley Scott already had the design for Prometheus 2 which would follow Elisabeth and David to the Engineers' home planet. Fox wasn't impressed with the box office figures of Prometheus and wanted an Alien movie with xenomorphs.
We're stuck with a compromise due to the scriptwriter John Logan:
"The initial screenplay was written by Dante Harper, but an extensive rewrite was performed by screenwriter John Logan. Logan had previously worked with Scott on Gladiator. For Logan, the main concept was to combine the horror elements of Alien with the philosophical elements of Prometheus. He said, "With Alien: Covenant, I just really wanted to write something that had the feel of the original Alien, because seeing that movie was one of the great events of my youth. It was so overpowering in terms of what it communicated to me and its implications, that when I started talking to Ridley about what became Alien: Covenant, I said, 'You know, that was a hell of a scary movie.' I wanted to write a horror movie because the Grand Guignol elements of Alien are so profound. We tried to recapture that with Alien: Covenant, while also trying to pay homage to the deeper implications of Prometheus. In terms of tone, pace, and how we chose to play this particular symphony, we wanted to create a really frightening movie."
Unfortunately he failed to reach the level of the first three Alien movies as well as Prometheus (under-appreciated) due to some rather stupid writing. When you land on an alien planet with it's own ecosystem and evolution you do NOT just sit down in a forest and mess about as if you're in your backyard.
I knew before I entered the cinema that Scott had been forced to compromise his vision with Fox bringing in a new scriptwriter to replace Prometheus 2 with a low-grade Alien-prequel. The attempt to connect Prometheus with Alien(s) was too obvious. It's like Prometheus 2 was already made and they just took scenes from the end of Prometheus 2 and copied it to Alien: Covenant.
All in all it was a disappointment but still watchable and somewhat entertaining. I'm giving it 5/10 due to all the flaws, the rewrite, the compromise, some silly scenes and weak writing, esp. the weird personality-change of the character David. Still, it's a must-see for fans of the Alien franchise. You will get a few glimpses from what would have been Prometheus 2 in the movie and I recommend watching the official "prologue" which is available here on IMDb as well as YouTube etc.