It's my personal favorite Godzilla film. It's not only the first Godzilla movie I've ever seen, but also the first film I saw in theaters. I would not have been a tokusatsu fan otherwise.
It's the best of both worlds, and has had many things that appealed to children at the time: A giant dinosaur-monster teams up with an Ultraman/Mazinger-style robot to fight cool-looking evil monsters!
This film also had the cutest-looking Godzilla. Since I was also a dog fan, he reminded me of a puppy here (he looked a lot like Snoopy, and even Clifford, as if Gou Nagai drew them)! This Godzilla, like the 70s Godzilla in general, was a major inspiration to me, and is my greatest superhero.
Every time I saw a Shogun Warriors toy as a kid, I always thought of Jet Jaguar! (Before learning of, and eventually, seeing the anime shows these robots were from!)
The human character angle is admittedly really odd, but still quite enjoyable and imaginative. The characters are like no characters from Godzilla films before or since. Gorou, Rokurou, Hiroshi, and the Seatopians have a very quirky charm to them. Even for a Godzilla film with minimal characterization.
While Riichirou Manabe's music is quite different from the likes of Shunsuke Kikuchi or Chuumei Watanabe, I like his score! It's quirky, and yes, even dated, but it still has a wild 70s charm to it. This is a more exciting score, in contrast to his darker score from
Godzilla Vs. Hedorah. Plus, Masato Shimon (my favorite Japanese singer) sang the theme song!
Plus, stock footage aside (I always find stock footage of the Maser Tanks amusing!), Teruyoshi Nakano's FX, though done on a much shorter time than other films, are still quite good! I especially like the deserted landscape scenery here. The scenes with the dried lake, and Megalon attacking the dam, are quite praiseworthy.
I know it's not a film for fans of the older Godzilla films, but it's not meant to be taken too seriously. It also works if one recognizes its target audience, and how well it works on that level. This film CRIES for a US DVD release!