Eh? Just looking at some of these and thats.... made up?
I'm not saying it's a triumph, not really excited by it at all, but to claim it's inferior to a 280 non-x in all the benchmarks you've seen so far seems a bit of a lie.
e.g. Neoseekers in the post you quoted - it beats the 280 in BF4, in metro LL and every other game. Yes, it occasionally loses out, but on the whole it's matching or beating it. It's meant to be roughly a like for like replacement, so why would we expect it to be otherwise? It's not claiming to be the next-gen replacement for the 280 in the advancing performance way, nor is it priced as such.
I think when AMD release the 285X it is going to be quite a performer and I suspect with more volts it will have a lot of overclocking headroom, HD7970/280Xs I think will be under a lot of pressure.