Wow, nice to see somebody actually posting in here!
I have a fondness for this film that I can't quite explain. The SPX are relatively poor, the film has odd pacing, the characters are only marginally interesting, and the ending is a love or hate kind of thing (I personally dig it). It doesn't help that the English dub seems to have been dubbed at Frontier Enterprises (who did the international dubs for EBIRAH, SON OF GODZILLA and DESTROY ALL MONSTERS), and is particularly bland, and makes the film a lot harder to endure. Had it been dubbed by the Hong Kong dubbers, it may have been more enjoyable in a "so bad it's good" kind of way.
Beyond all of that though, we have a bizarre 70's tokusatsu piece that manages to be somewhat atmospheric, for such a ho-hum film, and surprisingly gory for a "dinosaur" film (I know they're not dinosaurs, but it still fits into that category, IMO). The music, while not everyone's cup of tea (IMO), rocks. Sure, some of it sounds like it was derived from a bad 1970's porno , but maybe that's part of the charm.

I can't quit explain it. I just like funky 70's music *shrugs*.
I'll have to watch it again to see how I feel about it (it's been a while), but I've always liked the film. I much prefer THE LAST DINOSAUR (which is a lot better, and more "fun" overall), but I can't deny that something about this film resonates with me. It's more than likely my fondness for 70's tokusatsu, more than anything.