Actually, I don't agree. I think education should be enjoyable. Students learn better if they enjoy being in class. But they should learn their discpline, not idealogy that is spewed at them at the discretion of a given teacher.
But I completely agree with you that there are no standards anymore. The problem is, that is being worked on at the college level and not the way we would want to see. Standards are being written as we speak. The aim is to get all schools the country over teaching the same thing and then have students pass a general standardized test in order to pass the class. There will be standards, but you will not be happy with them. But even so, I agree completely with the point you are making. There needs to be some agreement on the substance on the displine taught.
Unfortunately, the humanities do not have objective standards. Plato would tell you that the state should apply them. Certainly the academy, through consensus or otherwise, cannot be trusted to impose them anymore. That's who we've depended upon in free societies.
As a believer in a free society, I don't want the state to do so.