Yea! Nvidia spent their valuable resources for all gamers to enjoy better graphics in this game. At least show some appreciation for their effort.
Take notes from this guy and enjoy. Don't let your brand loyalism blind you from the beauty of this game powered by nvidia technology.
If you are not happy with how your product performs in certain situations, then make a better decisions.
As far as I know AMD also helped the game developers implement Truehair, which is an improved upon version of TressFX from the first game. It seems to run equally well on GPU's from both brands though I'm not seeing too much praise from people "thanking" AMD for working with the dev on that. Either way, it seems both companies worked with the Dev at some point in time. I personally don't think that gameworks or NVIDIA's involvement has sabotaged the performance of this title on AMD cards, apparently new AMD drivers for the game are on the way.