This is a good, and hard question. It is very relative to ones specific area I think. There are so many things about my specific area that have me considering home schooling my son when the time comes.
Recently a friend shared a cute picture her daughter had submitted in art class. The problem was the teacher told the girl "this is beneath your age level, I am very disappointed at your work. This child is a straight A student, yet somehow her artwork is not up to snuff with her teacher.
The problem I see is that the teacher should not have put the student down at all. We wonder why bullying is such a serious problem yet, I see teachers bully students all the time.
She is a straight A student, most likely not destined to be an artist. We are not all artistic by any means, yet we all have something to contribute to society.
I think perhaps standardize testing could use a bit of a re-vamp, lumping all children into a "standard" may not actually be allowing us to see in what areas children excel. Not all children excel in the same areas, does that mean they will not go on to do great things?
I would like to see more "life" classes, if that makes sense. We teach them History, English, Math and so on. What we do not teach is important. Simple things like "money management", understanding credit scores, Gardening and food preservation would all be beneficial. Balancing a check book is something simple, yet so many kids grow up and venture into the world with no idea what life is like and end up harming their credit, and bank accounts.
Gardening and food preservation was a way of life at one time. I think it could help in so many ways. If you teach them to grow food at an early age, then perhaps if they end up down and out they will still be able to feed their families.
I am sure there are other issues I am not touching on, though my lil guy is not two yet so I have a limited knowledge of our schools system.