"Us" was a solid, entertaining, interesting and, well, weird movie. I'd give it a B, but I think that might have more to do with my heightened expectations.
Lupita killed it though. She's already had multiple star turns, but if this doesn't get her more roles, I don't know what will. Winston Duke does well with what he's given, but his character goes from funny to friggin' annoying by the end of the film. The kids are great at their roles as well.
It's definitely well made and Peele's a great writer and directer and it shows on the screen. I'll admit that the film kinda stays with you when it's done in that it gets you asking questions because you'd like to know more about the mythology presented.
As others have said, I called the twist VERY early on, but Peele does a good job of trying to throw you off that path to the point where i doubted my very own prediction.
All in all, it was a great film experience and definitely a great, creative horror film. I recommend it.