I am a huge horror fan, and this is one of the movies that unsettles me the most. The suspenseful pace, the incredible, beautiful but haunting visuals make this a unique experience. I love gory films, but this one relies a lot more on psychological horror and imagery to create scares. No jump scares, just good story telling.
The movie may not answer all the questions it creates, but the viewer, if he pays attention accordingly, will be able to figure them out for himself.
Unsettling to the bone, The Ring is one of my favorite horror films of all time. Truly underrated.