If you're below-average, AI writing looks great. If you've above, it looks horrible. That goes not just for writing but anything else created by AI --- it's the average of its training data, which is also going to be average in quality.
I didn't notice that this was AI myself. I tend to start skimming when the interesting bits are spread out.
There's two variations of this that are very common:
* Watering down - the interesting details are spread apart by lots of flowery language, lots of backstory, rehashing and retelling already established points. It's a way of spreading an cup of content into a gallon of text, the same way a cup of oatmeal can be thinned.
* High fiber - Lots of long-form essays are like this. They start with describing the person being interviewed or the place visited as though the article were a novel and the author is paid by the word. Every person has some backstory that takes a few paragraphs. There is some philosophizing at some point. The essay is effectively the story of how the essay was written and all the backstory interviews rather than a treatise on the supposed topic. It's basically loading up your beef stew with cabbage; it is nutritive but not particularly dense or enjoyable.
Both are pretty tedious. AI can produce either one, but it can only hallucinate or fluff to produce more content than its inputs. As such, AI writing is a bit like a reverse-compression algorithm.