I'm kind of torn whether reviewers should focus on the unique card itself—the shroud, the fans, the quality, etc—or the GPU. On the one hand pretty much all shrouds and designs manufactured today by the likes of EVGA and Powercolor are adequate, and what distinguishes them from one another is usually a mere few degrees or a few decibels. Pay more, get more bling, get more cooling. Pay less, get less bling, get less cooling. It's quite simple really. So reviewing them on that merit seems like a tedious almost inconsequential thing, and instead reviewing it on the GPU itself would be more apt. But then once you've reviewed it you shouldn't have to review it again since performance will be the same.
I think your method of focusing on the card and not the GPU is fairest. I'm more in favour of that.