The problem is there is nothing wrong with the market this generation. People are fabricating "discrepancies" so they have something to argue about (which seems to be the point of this forum, really). The 7970 came out first, was noticeably faster than the GTX 580, and was priced accordingly. Once competition came out, prices readjusted across the board. This is how any market ideally works.
Now there's a wide-range of products across the board, with AMD's cards offering better bang-for-your-buck to the overclocker and NVIDIA's cards offering better power consumption numbers.