You still using it naked then?I think the fine scratches on the back are just like the ones you get on the screen. You only see them if you're looking for them and shining the light just right. I honestly think it's a non-issue.
The look of the Jet Black is unparalleled greatness. I know that's subjective though.
The grippiness, however, is much superior to the 6s I had and the other finishes of the 7. Holding one you can immediately tell that it doesn't slide out of your hand nearly as easily as the others.
I honestly think the OCD crowd is missing out. The Jet Black iPhone 7 is the best looking phone I've ever used and it performs like a champ.