I offered the BOB books to my son when he was ready for them but they are incredibly boring little books for even 2 and 3 yr olds. My son refused to read those at all. They made him mad. I think it was insultingly simple and lacked a story line he could get in to.

Have you tried books that interest your son? My son loved the "We Both Read" books where child reads one page and adult reads the other. They were sillier and more interesting and great for early reading skills with several levels offered. He also loved the SPOT (you know the dog) set that was like BOB but more fun. The "Tub" book was his very favorite of those. From there he liked Clifford or Bob the Builder readers then somehow we ended up at Magic School Bus and Magic Tree House from there followed by Box Car Children and Hardy Boys. It changes quickly once they get it.