Watched the first 1/3 or so of the live action Little Mermaid.
Pretty awful. The animals don't play instruments, Flounder no longer has an actual character design but is just a normal-ass fish, they ruined the rock-splash scene, Sebastian sounds like they used the first take of all of his lines, and almost everything outside of the songs is a shot-for-shot remake of the first movie. Nothing added whatsoever, apart from one scene that does a decent job at adding to Eric's lore.
Eric also has an I Want song, which is super boring because the lyrics are just him describing what he is physically doing at that present moment, as well as using extremely uninspired descriptors for his feelings ("I just cannot get over you" wow so creative). Also at one point in the song he describes Ariel's voice as being like "a siren that guides me". Do the writers not know what a siren is? I feel like if Eric saw Ariel as a siren, he would probably want to stay really far away from her at all costs.
Biggest upsides are the vibrant colors, a majority of the actors (Flounder, Ariel, Scuttle and Ursula), and the hair physics that were probably half of the production budget.
I have to wonder what it would be like if this was someone's first exposure to the Little Mermaid. They'd probably still like it a lot, since Little Mermaid in and of itself is a fantastic story, but man, I really hope that's not the case for too many people.