Premise - 13/20 - The trailer made the movie seem pretty confusing. Aliens, maybe? Horses, and Glen from The Walking Dead? Not sure what's happening, but interesting enough to get me in the door.
Cast/characters - 12/20 - I liked Steven Yeun, his back story, and understanding his folly. I've seen Daniel Kaluuya around and he seems like a good actor, but I didn't like him in this. Smart, but unlikable. Keke Palmer was funny and an unlikely hero. The actors were OK, I guess, but I never invested any emotion in the characters.
Story - 15/20 - Original, as I'd expect from Jordan Peele. A great storyteller. Tangential scenes from Steven Yeun's past were interesting and yet vital to his character's psychology. A bit of a slow burn and convoluted ending, but from front to back it was mostly enjoyable.
Dialogue - 17/20 - The movie incorporated a "show, don't tell" philosophy that I enjoy, but the dialogue was able to let the viewer know the mindset of the characters and help develop relationships.
World-building - 15/20 - The setting wasn't that riveting, but I liked the connection established between the UFO's, the characters, and the ranch.

72/100 - 3.5/5 stars - Good, not great. Kudos for originality, bummer to the lack of interesting characters. Plus to the side plot with "Gordy's Home", minus to the subplot of the ranch and the family history. Watch it once to say you did, but it wasn't re-watchable.