[quote
I had heard that WW2 Japanese rifles were crap,
[/quote]
You probably heard correctly, but the speaker was lacking in knowledge. There was some junk made late war,, typical of a desperate nation on it's last legs, but the bulk of the Japanese small arms were well made solid guns. IIRC, Hatcher tested the model 99 Arisaka and found it to be the strongest action of any of the bolt action rifles of the war.
An interesting informal review of Japanese small arms can be found in "Shot's Fired in Anger", by John George, an army veteran of Guadalcanal and the pacific campaign.
He was a Illinois State Rifle Champion prior to the war, so had a strong interest in firearms. A good book, the NRA used to have it available.