Since when cherry-picking a few games serve as representation of the overall performance?
Shogun 2 is a HIGHLY AMD optimised game, and the so-called 6870 "beating" the GTX560Ti in Crysis it is only by 1fps...if both card were overclocked, the GTX560Ti will run ahead because of it capable of overclocking by 15-20%, whereas the 6870 will only overclocked by around 8-10%. Also, the 6870 does not beat the GTX560Ti in Metro2033:
http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_560_Ti/16.html
6870 is a good card for the price it is at, but whether or not it is worth stretching the budget for the GTX560Ti that is another question. However, trying to claim that 6870 is on par with/better than GTX560Ti on performance is just WRONG.