I just wanna say that The Little Mermaid was my favorite Disney movie growing up. But that does not at all effect how I view Ningyohime, and I will not be comparing the two, because I no longer watch American TV.
Story: 7/10
The overall idea is very sweet and romantic. I thought everything was paced well, and while I haven't read it, I've heard that it's true to the original source material.
Art: 5/10
It's... okay. The animation, while it's not the best, is just all right. Nothing special. I mean, it's no Kimi no Na Wa, but it's certainly no School Days. I think it's especially good on the dolphin, Fritz. Yes, I'm literally the only person so far to call him by his name. I can't tell if the animation is so mediocre because of the animation restrictions back then, or if they just had a low budget. Probably both.
Sound: 5/10
There's only one song in here, and it's not that good. As for the Dub, DO NOT WATCH THE DUB UNLESS YOU HAVE A HIGH TOLERANCE. PLEASE. DO WHATEVER YOU CAN TO FIND A SUB VERSION. The Japanese voice cast is fine.
Character: 4/10
Meh. It's okay, I guess. Fritz is just kinda your stereotypical cute sidekick, the Prince is a blank sheet that's just there for eye candy, and even fails at that. Marina, the main character well, she was just kinda there. And really, there were several parts where I really didn't like her, mainly when she went to trade her voice.
She met some random guy whose name she never found out and was like "Oh! I'm gonna to the evil witch now without any other build up!" And then when Fritz, being smart and all, tries to stop her, she's like, "If you dare stop me, then I'll no longer see you as a friend! We'll be enemies!" That was when I just lost all sympathy for her.
Enjoyment: 6/10
Really, the only times I ever really found myself smiling were the moments with Marina and her Hojo-sama. They were really cute and entertaining, I dare even say, adorable. If you're gonna watch this movie, just watch them for the few moments they share together. They're pretty cute.
But the cat... why the evil cat... WHY MUST YOU DO THIS TO ME!!!!!!!!!!!??????
Overall, 6/10
I think Ningyohime is an average movie. A lot people seem to like it, and it seems to hit them in the feels, it's not for me, though. Check it out for yourself, you may or may not like it.