Google staff aren't allowed to share Imagen results with you, unfortunately.
Getting 3 of something 1/6 of the time doesn't really sound like it groks the request.
I would not use these models for graphs yet, but for cool look tarot inspired "clipart" or background images, I think they are already usable.
The faces often look very good and they also have symmetric complexity and individual elements that come in a specific quantity (2 eyes, etc). Lower quality models do generate fly-like multi eye faces, but newer ones are so much more precise!
It's kinda sad that Google desperately wants the cool points for having its own DL models but you can only see it in the form of a store window display.
They probably also remember signing an NDA, and maybe taking some training about how not all of the world's information should be made universally accessible and useful to everyone. For instance, the contents of a user's inbox.