The question I have in my mind is whether the Godzilla audience that is primarily there for big monsters (and/or powerups) is the American / English language audience vs the Japanese and global one.
Monarch is ranking better with Asian audiences than English speaking ones, which suggests that it may have a different reach than other American licensed-kaiju media.
I haven’t seen any Japanese reviews — the Japan Times feature was more about how the show is being increasingly produced in Japan.