Like most people writing a review on this, I'm a big fan of the original movie. I saw Splash Too a couple of years after it came out and watched it repeatedly because, you know - mermaids! But even as a 10 year old I was fully aware that as sequels go, this was right up there with the worst. As another reviewer succinctly put it: when hardly any of the original cast or crew want anything to do with a sequel, take the hint. That is a bad omen.
The replacement actors were not good, but to be fair on them I think
Tom Hanks and Daryl Hannah themselves would have struggled with such a terrible script and direction. Rescuing the dolphin could have been a good plot if it hadn't been handled so feebly and cringely. That sums the whole sorry affair up really - cringe, cringe, cringe. I've given a generous 4 thanks to nostalgia and the fact that Amy Yasbeck was ok as a mermaid all the time she was underwater and therefore not delivering any cringey lines of nonsense.