Outstanding.
Epic.
Straight to the upper echelons of my all time greatest war movies list.
I had never heard of it until I recently read a list of films with the best flying sequences and the air battle scenes are riveting.
Caveat: if you don't like CGI, you won't like this. It's 2013 CGI, not flawless, but the sequences are so ambitious and well planned that if it had been put together by the people who did "Dunkirk" it would be one of the greatest war movies made.
(It's on my list, but that's my list.)
And that includes the predominant very well written, emotionally satisfying drama plot that atones for any nit-picky production flaws.
"The Eternal Zero has come under criticism for its nationalistic and sympathetic depiction of the Kamikaze pilots."
Oh, STFU.
There is nothing 'glorious' about it and if you can watch something like this without sympathy...
No matter why or who you fight, the fighters are proud of their victories and devastated by their defeats.
I've certainly never seen a better 'Japanese side of things' film.