I've had the same experience as well. I heard tons of people clamoring about the ability for LLM's to write SEO copy for you and how you can churn out web content so much faster now. I tried using it to churn out some very specific blog posts for an aborist client of mine.
The results were really bad. I had to re-write and clarify a lot of what it spit out. The grammar was not very good and it was really hard to read with very poorly structured sentences that would end aburptly and other glaring issues.
I did this right after a guy I play hockey with said he uses it all the time to write emails for him and pays the monthly subscription in order to have it write all kinds of things for me every day. After my trial, I was really wondering how obvious it was that he was doing that and how his clients thought about him knowing how poorly the stuff these LLM's were putting out.