Very true, it is easy to argue bias with any results. Since the driver updates it is generally found across many benchmarks that the 660 is marginally better than the 7850 at stock and the 660Ti is the equivalent of the 7870. It depends a lot on the review, the drivers used and updates for the cards for the game.
The 7950 sits just below the 670 and the 670, 680 compete with the 7970. There is also the 7890 that is about to come out. That will fill the gap between the 7870 and 7950.
What seperates them clearly though is the AMD cards generally OC very well (the memory bandwidth lets the 660 down, effectively bottlenecking it).
Or i guess on the other side you get 3D, PhysX, TXAA, Adaptive-Vsync!
I'm only gaming at 1080P so i guess memory bottleneck wont be too bad .... though at higher res with AA i can see issues...
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