Personally, I think that it would have been a better idea to keep the old title "Nymph" because "Killer Mermaid" gives away too much of the story.
It's basically a "man go to isolated area --- finds monster --- monster kicks ass" story. What can I say that sort of story is pretty common in horror.
While we see a lot of skin, there was not a lot of nudity in the movie. The first female victim was topless and we probably could have done without it (what am I saying?).
The movies is a bit disappointing. The cgi mermaid is poor. The gore level is wimpy. The horror level is lame. While the actors are young and attractive, the acting was poor at best.
The ending sets up a sequel but I doubt we will see another. I give this mermaid a 1 in 5 stars.