I had a major falling out with school over these books. they are utter crap, DD is a sight reader and hated phonics, she also hated these books. Luckily her teacher in reception was excellent and let DD sit at the side during phonics, reading Famous 5 books.
Another issue with ORT is that you can guess the sentence from the pictures, we were advised to cover up the pictures, which is 90% of the book!!!!!! That was the point I bought all the old Ladybird books which DD read and then she moved onto Enid Blyton...not great literature but grammatically correct, no pictures, and interesting plots, for the most part.
The later ORT are not too terrible..the Magic Key ones are ok. DD used to read about 10 a week as "officially" she had to be seen to read all of them. So she read them as fast as possible to get them out of the way...like nasty medicine.
There are other reading series books, I cannot now remember the names of them, but the school did have them in an old box...
I think there was a Cambridge reading series which was less crap as well.
In the end I bought all the Little Grey Rabbit books, Charlie and Lola books and Winnie the Witch, which DD enjoyed far more.
If your DD is bright she will get the argument that she needs to be seen to read these books and the faster she does this, the faster she can get onto the interesting stuff. This was how I pitched it to DD...plus sweets when she finished a level.
And keep complaining to the teacher that these books are trite and unimaginative and that the artwork is crap, as well as containing historical inaccuracies.