What makes an AI UGC video useful enough to run as an ad?

Hi everyone, I'm Bilal, founder of Say It Again. I built it so store owners can turn their existing product pages into AI UGC videos, with generated presenters showing the product and scripts they can review before making a video.

In your opinion, what makes an AI UGC video useful enough that you'd actually run it as an ad?

Is it keeping the product's appearance accurate, getting a natural delivery, having control over the script, or something else?

If you've tried making one, where did it fall short? I'd love to hear a specific example and what you would have changed.