My dad tried friend rattlesnake once, and was not terribly impressed. I think he just thought it was bland, but that was over ten years ago, so I don't remember many details.
Wild Calling used to make gator canned cat food, so I brought home a can for my cat once. He was not a fan, but he is kind of on the picky side anyhow (I think he at least nibbled some of it). You can still find some on Amazon for a horrendously frightening price.