I remember interviewing once and they told me what they were working on.

I was actually familiar with the product, but it had some glaring shortcomings, and I kind of groaned a little inside.

And I told them that I liked some things about the product, but then I unfiltered sort of pointed out what was wrong. I really wasn't interested in working on it (though I didn't say that outright)

And then they decided they loved and needed me. (and I didn't go there)

Sort of like dating I think. Show a little skepticism and you might unintentionally get more interest than if you were open and sincere.