Saw this movie tonight via an advance screening.
My spoiler free review.
Just watch the trailer. You've now seen pretty much everything Alien: Covenant has to offer.
In short, I thought it was bad.
Honestly this film barely passes as an Alien film. Take the Alien (as in the Xenomorph we know and love) out of the movie and barely anything would really change about the story. Both the title and creature are tacked on to get your butts in the seat and to have something nice to show in the trailer. I'd say 90% of the alien scenes in the movie are what you see in the trailer.
It's Prometheus 2, and should have steered clear of anything close to ALIEN, because the things they did add just shrink the universe further instead of expanding it. Adds confusion to where there was once mystery and turns the ALIEN into a easily defeated threat. This is not Alien. This is, once again, a vehicle for Ridley Scott to ask big questions with nothing of substance to back it up.
I'm not even really angry or disappointed about it as my expectations were so low going in, but it's totally killed any fleeting excitement I had left for future movies. Fox and Ridley really have no clue as to why people love the ALIEN movies, and no clue as to where to steer it. It's a shame.