It's been really interesting to watch the reception of this image unfold on this site and a couple others I use.
The first thing I've noticed is that this photo causes disorientation in some people. They aren't sure if they are looking down at a waterfall from a high POV, or looking at water coming at them.
Next, it seems some people are really uncomfortable with a photo that has more than one subject. I do see where that's coming from. Trying to imagine looking at the image for the first time, Derrel said it best, the eye bounces around the visual elements, almost in a triangle pattern. I suppose part of the success/failure of the image is it seems to make some people uncomfortable that they have to spend some time looking at the image to extract their own interpretation. We are definitely at an age where most photos are comfortable and easily accessible for a quick digest.
What I'm finding in this particular shot is it's a lot of things, namely that it's confusing and not easy. It could be a combination of the wet rock and the flat light making it a bit more difficult to separate and interpret the light. It could be the visual weight the foreground leaf carries that pulls the eye away from the falls. It makes the separation of elements not as easily accessible as some other shots from the same area. Whether that's a good thing or a bad thing, I don't know!