I saw the film yesterday in Oslo and I must say I thought it was exhilarating, fresh and different. It's also one of those films that you either love or hate, I do not think it is one that you can be indifferent to.
The German language adds a nice touch, and the way it is used helps a lot with creating a believable atmosphere to some scenes. The actors are doing a good job of portraying the stereotypes that they need in order for the humor to work. The humor is pleasantly free from political correctness. And there are many nice references throughout the film, so if you have been living in a cave (or on the moon) for the last seventy years, I doubt you will find it as funny as I personally did.
The CGI is stunning when at it's best. It is not perfect everywhere, but all in all it is quite convincing. The style can best be described as toned down and with natural colors that work very well for this film.
The story is funny if you let it stand on it's own and accept it for what it is. Let yourself be entertained. I am sure that if you have a very critical mindset when going to see this film you will probably find something to pick on. Things could probably be a bit better and more consistent in a + $100M film, but I do not think we would see this expressive freedom in a + $100M film...
The soundtrack was also well thought of and added the needed atmosphere trough the whole film. Not one tune seemed misplaced and I thought it was very impressive.
I liked Iron Sky a lot, and I would recommend it in a heartbeat. I believe this film has the potential to be the cult film of the year. And I think it will do well for itself on cinemas around the world.