The phrase "ineffective ratings" means that the ratings or evaluations given are not helpful or accurate in measuring someone or something's performance or abilities. Full definition
Then we found out that teachers and principals could be rated ineffective overall, even without one ineffective rating in any of the three components. (washingtonpost.com)
Teachers who receive ineffective ratings for two consecutive years may face an expedited dismissal process. (hechingerreport.org)
The idea is to move teachers along the bell curve, she said, and it takes two consecutive years of ineffective ratings before anyone's job is threatened. (nola.com)