Hey folks, I went to watch Iron Sky last Saturday in a local theatre.
What can I say, this movie is great! The budget of 7.5 million EUr doesn't show at all - In a good way! There's lots of CGI involved, and it doesn't look any worse than a Michael Bay movie, so kudos to the effect companies for doing amazingly realistic effect shots on a very tight budget. There was no single scene where the CGI actually
looked like obvious CGI. This counts both for pure CGI scenes like the battles in space and overhead shots of the moon base as well as scenes in which life actors were composed into a CGI environment, everything worked flawlessly.
The film is also very funny, I didn't laugh that hard since seeing
Hot Fuzz a few years ago. Every gag (and there's lots of em) works, and a handful are just brilliant (no Spoilers, but you'll know what I mean when I say "Downfall", "North Korea" and "UN fight"). If you were able to laugh about
Team America, then you'll love this one, as most of the humor is derived from the peculiarities of international (co-?)existence, especially in regards to stereotypical American Jingoism

The acting is solid I guess, it probably helps that I saw it in German which means that at least two of the main actors spoke in their native languages (Götz Otto and Julia Dietze).
Speaking of which, the acting of Julia Dietze was at times a little weird, can't put my finger on it, but that could just be the script instead of her acting ability.
One complaint I have is that I wished they had used more music by Laibach, the soundtracks of the trailers were awesome but the movie features little sung music.
Again, not to spoiler anything, but the film actually leans towards a dark, bittersweet ending with some haunting images that reminisce of both post-WW2 history as well as possible future conflict, and that makes the movie on a whole more intelligent and sets it apart from the silly Sci-Fi flic most will probably expect.
Anyway, if you have the chance, go see it, I promise you won't regret it. If you only go to see one movie this year, consider supporting small productions like
Iron Sky instead of those run-of-the-mill BlockBusters that swamp the theatres every summer (although I will most definitely go see both
Prometheus and
The Dark Knight Rises 