Review of The Blue Lagoon

I do not understand why nobody practically liked this movie. As it is possible classics like this will be classed with 9% while horrible movies like Sharknado has 85% in Rotten Tomatoes. The Blue Lagoon is one of the best classics of the 80's, and one of the best rumors ever. Of course it's far from the best movie ever, but still pretty good. Gathering too much. I just did not like the ending.