I'm impressed by the AF system and iTR functionality. It's long past due that models other than the 1D received an advanced meter tied into the AF system. I think it will give the camera extremely accurate tracking, especially combined with 65 cross-type AF points.
I'm not particularly impressed with the IQ. I was honestly hoping for more...a LOT more. It's marginally improved over the 70D, seemingly mostly in terms of lower color noise (similar to the 6D at high ISO vs. the 5D III...much lower color noise there.) I was hoping Canon would take the opportunity with the 7D II to reveal an impressive new sensor, to show they are still in the sensor IQ game...but nope.
I'm also a little bummed the AF system is not comparable to the 61pt system in terms of point sensitivity. It seems most of the points are only f/5.6 sensitive, which means there won't be any AF performance bonus at f/4 or f/2.8 (outside of the central point(s), at least.) I think the AF system will perform well, but for those who have f/4 or f/2.8 prime teles, I honestly don't think it will perform as well as the 61pt system. The 1D X also provides increased AF drive power, so it will still focus faster (not even the 5D III focuses as fast as the 1D X.)
I think the 7D II, if it was really a "video" release, comes off as lackluster on that front, at best. Seems like everyone out there has better offerings on the video front. I think even though 4k hasn't hit it big in people's living rooms yet, for a camera that could potentially exist for five years, not including 4k seems like a mistake (even if it only lasts 3 years until replacement, that's three years where 4k TV and video will be getting cheaper and taking off even more.)
Aside from the AF system and iTR, which in some ways isn't as good as the 61pt AF system, I think the 7D II comes off as a bit lackluster. That's probably why there isn't quite as much excitement on these forums for it. It'll probably sell well...far too many people have pent up energy waiting to buy the 7D replacement, so they will probably sell like hotcakes for a while. It finally has some competition, though. Despite the 12-bit readout (which I personally don't think is nearly as big an issue as it's being made out to be), I think the Samsung NX1 could eventually present a viable alternative to the 7D II. It'll need lenses, or at the very least, a fully capable EF compatible mount adapter so EF lenses can be used on it. If I could slap my 600mm f/4 L II on the NX1, I'd be very, very interested in seeing how it performed. I think the BSI ISOCELL tech should be capable of providing superior IQ, and the high frame rate and impressive-sounding AF system is quite intriguing. (Biggest drawback for me is lack of an OVF...I'm not a big EVF fan...and the EVF in the NX1 doesn't sound particularly high resolution, so that could be it's Achilles' heel.)