I'm far less concerned about the single digit percentage difference between AMD and Nvidia's cards than I am about the difference in power consumption and heat.
I want AMD to be competitive on the GPU market and I'm glad there are now, relatively, affordable graphic cards available to consumers at MSRP. That is good news for everyone but the most cynical and I should know, I am one, but I do feel that AMD needs to do better. I don't as much feel they are being competitive, right now, as I feel they are overvaluing their products, and not just their graphics cards.
Before someone says I'm an Intel/Nvidia fan, yes I do have an Nvidia graphics card, as I've had plenty others in the past, but I am using an AMD processor. I care far more about performance and value than about the brand.