There aren't enough active roles; most of the humans are onlookers, either from the sidelines or safely tucked in front of monitors. The ones that do get involved had potential, but the slide to a more kid-friendly attitude (again!) meant the relationship was kept out of murky waters.
Mothra spends a lot of time in larval form. It's a long time before the unleashed imago form lights up the screen. But what's perhaps more of an issue is that the writer(s) seemed to have no idea what to do with Godzilla. The film should really be called Motha vs ______, with special guest Godzilla.
3 harmonies out of 5