The concept is not bad and it's likeable. Comedies with surrealist touches and special effects are something that is rarely done in recent cinema, it's more common in the eighties. Maybe that style hasn't made a comeback because it's been a long time since anything really big came out, but here there was some material to do something.
Kidman's role is fine, even if she's not an actress I like a lot lately because of her porcelain mug, as they say. But her role as the most cynical individual in a perfect community makes me sympathise with her. Bette Midler and the guy who plays the gay guy (I'm guessing it's Roger Bart, looking at the film's Filmaffinity page) also have a certain wit.
Matthew Broderick fits his role as a dullard but he's still a dullard. Glenn Close doesn't really do that much either, although her character may have some importance, and Christopher Walken does a bit of his usual stuff.
The special effects and the story are interesting up to a point, but also cloying for a while, on the one hand because it shows a cloying society and on the other because the alternative to that is also presented through a cloying moral.
And yes, it can also be a bit stale. Still, the soundtrack, the production design, the performances and the occasional funny dialogue are enough to make it more or less entertaining.
At least for me it's a lot more likeable and dignified than Frank Oz's last film, A Funeral for the Dead.