The movie was entertaining
Sci-fi fans, let's not be too critical. Most of us desire to be entertained, not overwhelmed by deep, philosophical, social, or existential plots.
I expect to be entertained when I watch a sci-fi movie. If that's accomplished the movie is a success to me. I don't expect every sci-fi movie to be another 'Blade Runner' or 'Fahrenheit 451' or '1984'. Some sci-fi movies become classics later on. Anyone out there remember, 'Soylent Green'?
I enjoyed the premise of accidentally-altered evolution, even though the plot device revolving around a squashed butterfly was admittedly far-fetched. Yes, I have heard of Chaos Theory - the flapping of the butterfly's wings in South Africa causes a hurricane in southern Florida. In actuality the dust devil swirling from the Moroccan desert onto the easten Atlantic Ocean metastisizes from a rain storm, then gale, then hurricane on southern Florida.
Didn't anyone relish the scene where actress Catherine McCormack briefly depicts what humans would have looked like directly evolved from fishes? I dug the catfish whiskers on her face and the eyelids that closed from the sides and not from the top. Unfortunately her altered sex appeal left much to be desired as a naked fish woman doesn't fit Playboy material.