There is not much point in writing a review of a book that has been already reviewed 948.467 times here, what more is there to say? So I'll write only very few thoughts.
The main characters, Catherine and Heathcliff, are so complex, mean and selfish that the writer must have had a twisted mind to imagine them. Their unbearable attitude makes their own lives a hell, and they are a burden to anyone near them, even to the readers who have to endure the narration of continuous drama and trouble.
My rating is an average of 2 stars for the first part (difficult, wearisome and frustrating), and 4 stars for the second part, much more enjoyable since the main characters become Catherine (daughter), Linton and Hareton, who are more likeable than their parents; there is also less unnecessary drama.