Unbelievably Stupid Writing - spoilers if you care
I watched this when I was ten and I'm sure that even then I noticed how illogical and stupid the writing was. Take the first episode... they go inside a live volcano and they are told not to worry, the geologist is responsible and wouldn't do anything dangerous... you mean like go inside an erupting volcano??? Why would they go into an erupting volcano? To find out why it's erupting of course. The question is... what were they going to do with that knowledge? "Quick! You grab that side of the Earth's crust and I'll grab the other and we'll put an end to this erupting nonsense! Now HEEEAAAAAVVVVVE!!!!!!!!!!!"
One minute they are trapped by a cave-in until they see the fire monster and they run right out of the volcano. The giant firebird sits in the lava minding it's own business not bothering anyone, but then, "Godzilla is our only hope!!!" and they sic Godzilla on the fire monster. Surprisingly, Godzilla now has lazer vision but has lost his atomic breath. Godzilla also comes off as the most incapable monster fighter ever and 'wins' by blocking the fire monster into a cave. Godzuki then incomprehensibly gets into trouble for splashing in the water and is forced to be towed in a dingy as punishment.
My four year old comes up with more logical stories while playing with toy dinosaurs.