I'm pretty sure the Dr. Suess books were meant for children just learning to read. I loved them when I was 5, when I probably wasn't ready for the classical fairy tales and such. And they were way better than Fun with Dick and Jane, which I had to read in school and found inane, even at the age of 6.
Granted that the Dick & Jane readers were boring and inane; however, there were plenty of great books, for beginner readers, available, before and after the horrible Dr. Suess crap!
Exactly. Seuss was a godsend for early readers.
Did you know he submitted to almost 100 publishers before Random House picked him up?
Talk about tenacity.