At what point does an AI video stop feeling "AI-generated" to you?

I've been experimenting with different workflows for AI videos, and one thing I've noticed is that viewers don't really care whether AI was used. They care whether the final result feels polished.

What makes you immediately think "this is obviously AI-generated"?

Is it the voice, pacing, visuals, editing, storytelling, or something else?

Curious what everyone notices first.