My sisters and I LOVE to play Nancy Drew games together, so we are constantly getting many different points of view on a game, and this game, for me, is defiantly one of my favorites. The main reason behind this is because I love the thrills, but for my middle sister, who hates things jumping out and anticipating things jumping out, this is her least favorite game yet, and (after we finished it) she refused to play it again.
As for the puzzles, they can be quiet difficult to solve, but (me being the one who loves puzzles) I really enjoyed the many different, traditional Japanese puzzles (like the nonogram, the renogram, and the door lock puzzle). My sisters though, who don't like difficult puzzles, would walk away and let me deal with these puzzles on my own.
All in all, this game is great for kids who love puzzles and want to be a little bit freaked out, but not scared to death (although, I wouldn't suggest playing it late at night or anytime when you are alone, especially home alone).