A big improvement!
Early in the first act, we learn that there has been not one but several creatures named Gamera since 1965. The same fact has been discovered about Godzilla, so this may not be much of a surprise. Gamera, in this film, makes quite an entrance. He’s back to destroying buildings and is responsible for several human deaths. He isn’t his benevolent self.
Gamera 3 has the biggest on-screen body count in the franchise so far. A news report mentions that the initial kaiju attack killed 15000 to 20000 people. This film is gorier than its predecessors. The violence is graphic, not implied. The special effects are solid. They are both practical and computer generated. Most of the time, we can’t even tell how they’re made.
This one is treated like a horror movie. It is suspenseful, somewhat scary and the human subplot is more interesting than your average Gamera procedural, despite the overacting. This is easily one of the best installments in the franchise at this point. They really managed to make the best out of monsters that are uninteresting and poorly designed.