I asked it to generate slides on a topic I know something about, and in my native language. On the one hand, the result is pretty mediocre, but on the other hand it is truly amazing that one can whip up a presentation on any topic, in any language, in a matter of minutes. I didn't review the result carefully, but already on first glance there was a wrong image, and some pretty ugly use of language. So the quality is below what i would expect. But as a starting point, I can imagine this is a huge time saver for a teacher if they want to discuss a topic spontaneously, and only have 20 minutes to prepare.
Even before the rise of AI I see lots of low effort lesson materials being used, where math questions are algorithmically generated by uninspired programmers. Or multiple choice questions where technically multiple answers are correct, but only is accepted. And there is no room for discussing why one option does or does not apply, just a simple right/wrong and next question. So even though ai generated content might be of so-so quality, unfortunately an interactive session with chapgpt is probably much more educational than the ("pre-AI") crap that is sometimes used today