immediately after the war when liberalization of the Japanese mind under American supervision the military was accused of sending "volunteers" on Kamikaze missions while the regulars were kept alive by assigning them to escort of the said planes . But then as time went on and Kamikaze attacks established as the norm and not single once in a lifetime operations the regulars were also in it , to the detriment of the Japanese war effort . ( This does not suppose the volunteers were good.) And while ı will agree on the last ditch death wish notion attacks which were always led by katana wielding officers if they were alive , the Japanese tactics were actually "fond" of the charge . Japanese machine guns were given bayonets so that immediately after using their maybe 30 round magazine the gunners were expected to join in the fun of bayonet fighting with a 10 kg weapon , historians find this somewhat over the top. And those who could not charge found other ways to die . ı think on Attu maybe up to 500 Japanese killed themselves with grenades after they charged but failed to break the American lines .
actually on Attu island, the fighting was pretty fierce, initially the Japanese dug-in on the high ground and managed to cause pretty high US casualties. As a last ditch effort, the Japanese launched one of the biggest banzai charges in the war, this attack penetrated the American lines up to their rear- echelon troops, and the Japanese went down fighting to the last man.
Then again, Japanese ground troops were also quite outmatched in comparison to the Americans primarily because the Japanese lost the battle of the logistics in pretty much every island battle they fought. Overall, you could probably compare the logistical support behind a single infantryman in the field, how much supplies are allocated to an operation per soldier, US tops the floor in this category, especially against Japan.
I mean, when the Americans invaded North Africa, they actually brought a Coca-Cola bottling plant with them to support the troops. In my opinion that pretty much says it all, considering how lesser war-fighting countries and economies had strict rationing of essential goods such as fuel, food, luxuries (such as coffee) etc... America was fighting the good fight and living the good life!
Germany was also fighting the poor man's war just like Japan, they primarily relied on horses for transport of artillery and such on the eastern front, their economy overall wasn't very self sufficient and healthy in terms of war production, not to mention the lack of fuel. (other than synthetic.)
Guadalcanal became known as the island of death because the Japanese ran out of food and had to resort to cannibalism, most of the Japanese troops simply just couldn't survive on that island.
US troops were also a little bit under-supplied which lead to increased sickness rates (dysantery, malaria), especially after the US fleet off of Guadalcanal "abandoned" the Marines and the vicinity of the island.
Cut off from fresh water sources, food and medical supplies, with limited ammunition available (even with hidden stockpiles), encircled from all sides by massively powerful US navy task forces bombarding down on them with battleship guns and airplane bombs. There was only so much a Japanese soldier could do.