"Mr. and Mrs. Dursley, of number four, Privet Drive, were proud to say that they were perfectly normal, thank you very much. They were the last people you’d ever expect to be involved in anything strange or mysterious, because they just didn’t hold with such nonsense."
J.K. Rowling, Harry Potter and the Philosopher’s [Sorcerer’s] Stone
This first paragraph is SO important. SO VERY IMPORTANT.
I think that Rowling deliberately uses the Dursleys to foil the wizard world. By describing the Dursleys as “perfectly normal” people who don’t believe in nonsense, the impression is immediately given that they lead a monotonous, non-magical life. This sets the tone to oppose the wondrous, mysterious, and nonsensical wizarding world we meet because, lets face it, the magical world we have all grown to love is extremely strange and mysterious. (Which only makes it more loveable, really.)
The fact that Rowling depicts the muggle world as uninspiring, and makes the first muggle characters we meet less than likeable, creates a deeper message about life. I think Rowling is suggesting that living in a mysterious, always-changing world is part of the magic of life. The “normal” people are not the ones who make a difference. The people who stand out, like Harry, Ron, and Hermione, are the ones who are remembered for being great.
Thanks, Ms. Rowling, for making a series that encourages people to be weird, to be themselves, and to live a magical life.