@acciochocolatefrog
On the one hand, I agree with you since I had read the books first and afterwards saw the films and was disappointed. There are so many little special moments and funny situations in the books (especially with Fred, George and Sirius) that you just can't put in a movie but which are essential for the book's plot atmosphere. On the other hand, I guess the books are less thrilling to read as you already know the main plot if you watched the films before reading. Besides, watching the movies first makes it more difficult to imagine the looks of the places and protagonists on your own when you read the books. So I am still fine with reading the books first ;)