Well, the intros average a max of about 2 pages in the large-font small-page Animorph books, which is like 30 seconds of reading and after that it sort of goes into actual plot matters. It might get repetitive, but it's not really horrible in my opinion. For the amount of time it takes to read, I think it's fair for the people who DO jump into the series. It took years to finish, so I expect a new kid to pick a book off the shelf with the prettiest cover sooner or later. I doubt that most people even here at RAF started with book 1 or 2.