Well, my oldest dd had a rough time with AR. It started out ok - she took tests starting in kindergarten - I believe the teacher read the test to them - unless there was an option on the program (I can't remember that far back!)
1st grade I don't remember much about - no issues I guess. 2nd grades was a new school & that school pushed AR. They have it said up that @ 25pts you get a t-shirt that can be worn every Weds (out of uniform). They set a goal that every student gets there by the end of the year. This 2nd grade teacher kept a big ole chart by the door that showed every childs' progress. This was the time when the boys started reading Harry P books & they smoked the rest of the class. There was no way to begin to keep up with them.
3rd grade teacher didn't really push AR - he was okay if you read or not - he'd let you read books below level just so you'd make your goal points.
Now dd used to LOVE to read & be read to in the beginning....she stopped liking to read - she read just 'cause she had to to get her tshirt (and fit in with the rest of the class) & really didn't read after that.
AR rewards @ her school are 25, 50, 75, 100. 25pts was shirt, 50pts was a gummy bracelet, 75 a cup & 100 key chain & pizza lunch with principal @ park.
The books 2nd grade & below are .5 point. Soooo you have to read 50 books just to get the 25pts

Actually I think the 4th grade book we read was just 1/2 a point as well (I read it to her).
4th & 5th grade was another school - this is wear the negatives really set in. This school believed in punishing students if they were not @ their reading level. DD had a silent lunch because even though her points were there her comprehension rate was not - she was like 83.5% when it was required to be 85% or higher. She missed the craft the kids did @ Christmas again because of her AR score. She had to read a book while the rest of the class was up & around working on their craft.

we went to the principal with no luck - she felt it was okay - she said dd wasn't being punished - the others were being rewarded.
this summer is the 1st time she has picked up a book for pleasure & she has read 2 books already & no - NOT on her reading level ( one was only 4.9 level)& probably not AR...but in mid school you don't have AR...she is now going into 8th grade...
AR for her was not a good experience. She felt the competition to be too much stress for her - she knew in her mind she'd never make it to the top so she just didn't try after about week 1.