I am writing this as someone who is on my way to get a naturalization in Japan, lol. It is quite hard to explain this movie to a non Japanese. Side effects aside, it is more to the attachment value of Godzilla/Gojira to the Japanese rather than what you see on the surface while watching this movie. That's why Japanese really like this movie.

This is a political movie, yes. If you don't like politics and expect an intense fight with Gojira the whole time like those western movie, this movie might not be for you. There are so many political issues they need to handle with. How the government should react when something not written inside the manual happened to the country, what the Prime Minister should do in time of crisis; stay with the people or run away, surrender to pressure or think of other way out. How the ministers should react fast to support the country; find a way out or give up. And probably the most critical point, what Japanese should do for Japan; ask for help from outside to take over or ask for help but still take control of the overall decision. This movie also tackled on sensitive issue for Japanese; the nuclear and radioactive stuffs and the army first big crisis after the post war. Awesome, I tell you.

Non Japanese might find all these stuffs are hard to relate thus tend to focus on the weird side effects, weird Gojira movement. Not to mention the music is so Japanese in so many ways. Try to see this movie in Japanese POV and you will find this movie is an extremely good one. Recommended.