Ive only had issues with a few of my daughters teachers over the years. One was last year, nice enough guy, ex military but all over the place and terribly disorganized. My wife and I constantly had to remind him to enter test scores and grades. It got so bad I that I had to contact the principle a couple of times when there were only two scores entered for an entire report card period with only 1 week left. I did not even feel comfortable holding my daughter accountable for her grades in his class.
The absolute worst was an elementary school teacher she had, she was a year or two into teaching. Very inexperienced and very insecure. My daughter got her one and only D in her class. This teacher explained to me that it wasn't uncommon for some children to struggle with Math and that perhaps we should look into getting her a tutor. I pointed out that she had never struggled with math in the past, suggested that perhaps my daughter wasn't the issue. Before and after that year my daughter lowest grade in math has been a B, missed the A by two points.
We always go to the open houses and meet with her teachers. We stay involved. And we set clear expectations of our daughter grade wise. Is she gets A's and B's she keeps her life as normal. If she does not then she loses some of the "distractions", phone, tablet etc, until she improves those grades.
We figure if we're involved our daughter will be too. We help where we can and ask the teacher for assistance when we can't. Must teachers are great and they typically go the extra mile to help ensure our daughter is successful in meeting our A and B expectations because believe it or not they want her to be successful too, well most do anyway.