I read what I thought was Robinson Crusoe as a child (and loved it) but that first version left out half the story (which turns out wasn't a bad thing). The story isn't really about a man being marooned on an island (though of course he is marooned for decades). It's really about one man's internal journey and how his view of life and himself change because he's forced by his solitary state to think about his past actions and the consequences of them. To me the interesting story starts about page 60 and ends soon after 200 while he's still alone on the island, before Friday the rather annoying saved cannibal-servant appears on the scene or the fantastical rescue.
After reading about the real man who inspired the story, Alexander Selkirk, I can't help wishing that Defoe had interviewed the man and then wrote the man's real story. It would have been equally bizarre, but more believable (particularly the real man's inability to settle back into Society - he lived in a cave for a while, married twice, but could only bear the married state for a very short time before running off...eventually back to sea where he died probably hoping to return to the island where he was happy with his goats and cats).
If you enjoy the history of words or getting into the head of an early 18th century man this can be an interesting book. If you like a story that flows smoothly and makes sense and has a sensible ending...you might want to watch a movie version.