A movie is torn between on offensively bad B-plot and a praiseworthy monster A-plot. A lot of love went into making a kaiju homage to Showa era. Its just that the B-plot is that bad.
For Giant Kaiju Monster Movies: Ranked list
Easily the best American Godzilla movie, and the best Legendary Kong movie up to 2021. Come to see a movie that checks the giant kaiju boxes: Great looking monsters, monster fights, early monster reveal, a mecha-monster, cityscape destruction, traditional kaiju themes and storyline, and (mostly) decent pacing. Loved the many references to past movies in these franchises and TLC for King Kong vs. Godzilla (1962) and Kong tropes like "Denham University". Heck, you…
For King Ghidorah and his relations: Jiraiya, Orochi and Hydra movies list
Kudos for Legendary bringing out Rodan, Mothra, and King Ghidorah in a modern Godzilla film. As an American "Godzilla" movie, it is much better than its 2014 precursor. Millie Bobby Brown is a good actress. Still, a little lighting of the monster so you can actually see the monster? Would be nice.