The main critique of AI is that it's a dumb hallucinating parrot. It can't do genuine human quality work at all, outside of extremely narrow domains like basic translation and copyediting. Even for Q&A, while it can be useful by quickly accessing a huge storehouse of learned knowledge, the vulnerability to hallucinations means that human expert verification will always be required.

I'll note that there can be multiple main critiques coming from an incoherent set of viewpoints, since this is public opinion we're talking about.

Between "AI doing creative work", if you believe, and "fraud", there's all the low-key filler material that's sub-creative and sub-fraudulent. There's a similarity between the phrase it was made with AI and phrases like I didn't bake your cake myself, it came from a store or sorry, it's just a cheap plastic one. So part of AI's image is that it's a flourishing new source of disappointment.