I'm quite positive this has been said before already, but not for a while.
The jump AMD has made between generations has rarely if ever been the kind of jump Nvidia has made from Maxwell to Pascal. The 1080Ti is almost twice as fast as the 980Ti. Considering the 980Ti is widely considered faster than the Fury X, to beat a 1080Ti AMD would have to go beyond doubling its performance after only two years. That has not happened before, even with a die shrink. Why would that suddenly happen now? Pair that with the possibility that Pascal was an unplanned but very welcome byproduct of a surprisingly extremely efficient shrink of Maxwell down to 16nm and you have what many are calling AMD overhyping a product—which is just not true.
Other than the stupid "poor volta" dig in one of their promotional videos, and maybe one or two cryptic comments, AMD have not hyped Vega to be anything more than what it is. It is you, the collective community, that has decided AMD needed to beat Nvidia at every level. When has AMD made the claim that it will beat the 1080Ti?
Speaking for myself, I remember posting about six months ago that I wanted a card around €600 that performed around a GTX 1080 with a nice overclock (say, 2Ghz on the core). The only reason that has changed is because AMD has taken too long and because the 1080Ti came out. Think about that. AMD planned a GPU. That GPU was delayed. I thought it would be out by now. HBM2 or whatever dashed those plans. Then Nvidia dashed their plans further with the 1080Ti, a 1080 price drop, and the Titan Xp. That's not AMD's fault exactly is it? It is their fault for focusing on expensive technology that is before its time, but not their fault for overhyping their GPU's. The comment "I still hope AMD knock it out of the park" is part of the problem. Nvidia has already knocked it out of the park. How much further can a company hit the figurative ball? Think about that analogy. Nvidia has already knocked it out of the park. There is nowhere AMD has to go. The issue is not that AMD have made a crap GPU or that they have overhyped it. It's that it's too late and is up against unreal competition. AMD knocked it out of the park with Ryzen because its main competition was happy chatting up the chicks in the bleachers with it thick... 'bat'. Nvidia on the other hand has been killing it with essentially just a shrunk down version of their previous architecture, one that was already better than the competition.
I don't get why half the Internet is so mad with AMD. They should be mad with themselves.