Your concerns were my own when mine were young and the answer to your inquiry is that, yes, most are twaddle. The ones I allowed were like those mentioned above-simple reading books but not books for simpletons! Of course, this also means you have to get books written prior to the 50’s, with jsut a few exceptions, IMO. Children’s lit. started going down after WW II.
But it’s really not difficult to find good children’s literature that is easier for them to read. For actual school “readers”, the PAthway’s are good, but I found that the Elson ones were better; pulled together prior to 1925-there’s absolutely no twaddle in there! Published by Lost Classics, Primer thorugh Eight:http://lostclassicsbooks.com/catalog/6?page=1
I did not use the TG’s with them. Also, if you can get a hold of them, older collections of fairy Tales, folk tales, poetry and children stories collected in these two collections (you will have children who love reading if you can get at least one of these, they are so rich); I got mine from my grandmother:
1)My Book House (prior to 1950’s) Vol. 1-12 with the first two suitable as early reading, both aloud and eventuially on one’s own. http://www.valerieslivingbooks.info/mbh.htm They are wonderful!
2) Book Trails VOl. 1-8 http://www.librarything.com/series/Book+Trails
I have the red bound ones. My son read thorugh all eight Vol. and stilol goes back and reads them and he’s 12. Again, the first couple are for the youngest crowd with each book getting more advanced in reading ability-just like My Book HOuse.
Other authors and books:
Robert Louis Stevenson
Ezra Keats
Arnold and Anita LObel
Corduroy and the sequels-DOn Freeman
Caps for Sale
MAurice Sendak
Harold and the Purple Crayon
Margeret Wise Brown
Tomie De PAola
The Story about PIng
The original Madeline books
Robert McKloskey
Stone Soup-MArcia Brown
The Giving Tree – Shel Silverstein
Virginia Lee Burton
Owl Moon – Jane Yolan (and others of hers)
The Little Engine that COuld – Watty Piper
A Family Treasury of Little GOlden Books
The original Babar books by Jean De Brunhoff and the original Curious George books by H.A. Rey
HTH!