Robert,
Your critique sounds rather harsh...
The D750 doesn't have the pro body of the 810, but it doesn't have the body of the D610 either. Or, as dpreview puts it: "The D750 is essentially a lower resolution, less expensive version of Nikon's D810 but if actually offers quite a bit more, including a better autofocus system, faster burst mode, tilting LCD, and built-in Wi-Fi. The major trade-offs are build quality/durability and resolution. If that sounds like an impressive camera to you, then you're absolutely right."
There are many reviews out there which suggest that the D750 hits the sweet spot in a number of areas:
https://photographylife.com/reviews/nikon-d750
http://petapixel.com/2014/10/14/nikon-d750-review-nikon-youve-created-monster/
http://www.dpreview.com/reviews/nikon-d750
http://www.thephoblographer.com/2014/11/07/review-nikon-d750/
...
Kind regards,
Johannes