I feel as if (and this only my opinion which is worthless) the ones doing the crying are not the people who the 7DII is aimed for.
There is a lot of truth to that.
You have landscapers moaning about only 20Mpix and the usual DR nonsense.
That said, not everyone can afford two bodies and some who care about the things the 7D2 excels at surely would have loved to have it had an exmor-type sensor and excelled at all types of landscapes as well (and even for wildlife, there are times when more DR helps, due to say dappled lighting or heck even times when things change super fast and either you or the camera accidentally underexposes a low ISO shot, with exmor that doesn't matter half as much). And the DR stuff isn't nonsense. Not everyone will care so much, but people who do care, do have a legit reason to care.
But that also said, it is true the sensor is good enough to get by with for an action/reach/speed/AF oriented wildlife type camera.
Although it does send a bad a message as to if Canon ever plans on improve their sensors at low ISO.
Then you have videographers banging on about the lack of 4K.
Again, it is true that Canon has treated the 5 series the primary video quality advancement line and for the primarily stills wildlife guys it doesn't matter.
That said, some wildlife guys DO like to take videos and 4k surely makes wildlife type stuff look better.
Plus they left out zoomed modes, precisely the modes that would especially have made sense on a wildlife camera. And they left out focusing aids and zebras. And they even left out touch screen for easy control of target subject or changing when using DPAF. And the tilt screen which also helps for macro wildlife and even for things like team sports circle celebrations, etc.
And it also means they have more room to cripple the 5D4 video and there is a lot of talk now that even the 5D4 video will be a total disappointment. So of the complaining is just fears over the 5D4 and where Canon is headed and how much more can they keep holding back and crippling this or that.
And it's not only that they left 4k out of the 7D2, they didn't even give it a nce, natural, detailed 1080p, but the same old waxy look even though it has so much digic power.
Meanwhile sports / wildlife photographers are quietly pre-ordering. If I was a sports photographer I'd be pretty excited to have the 7D II either as a back up or main camera. I have a feeling once some solid reviews come around and people get to feel how easy the camera is to work with (loved my 7D ergonomics) things will calm down.
That is true too and as I said above, the 10fps, with that AF and that reach should make it, even despite the sensor, a stills wildlife or even sports photographers dream. It should be a total beast and that whole crowd will likely be over the moon and with good reason.