Ghidorah looks great. The concept is ok. But let's be honest, nothing much happens. The philosophical concepts are interesting though.

There's still this emphasis on how the very way of being of different alien races are so different that they're impossible to understand. Everyone wants to kill Godzilla. But the humans want to take its place. The Bilusaludos want to become like him. The Exifs want to feed him to their god. Though if your cult can't exist without lying entirely on its god and its goal, that's a pretty bad sign.

After the second one I wondered if Ghidorah was the Houtuas' god. Turns out it's not. [spoiler]Ghidora is the Exif god. Theirs is definitely Mothra, which you can retroactively see on the wall.[/spoiler]

The idea that all civilizations are bound to give birth to a Godzilla like monster is interesting. Either as a reaction to their self destructive behavior, or as the natural next step of evolution, as if civilizations only goal is to create Kaijus. And then the next step, it's all so that [spoiler]Ghidorah can feed on them[/spoiler]. Why not.

Not to clear on how they manage to invoke Ghidorah though, or even why they don't do it before. And I guess it's a deliberate blur on what it actually is.

The trilogy as a whole is worth watching, for the concepts, and for the design, and the second one for the action too.