People would probably hate me for this, but the lightning thief. It was the book that got me into reading.
Hey man! The Percy Jackson series is pretty great and we always look at our first love with nostlagia.
I have very fond memories of Clive Cussler pulp novels even though I can recognize how formulaic and Mary Sueish they are.
I don't know very many people who would give you hate for this. This series was MY "Harry Potter." First book series where I awaited each release and made sure to get each new book on release day. I remember being so excited for the movie when it came out. The movie was my "The Last Airbender."