Can't speak to the GPS issues. I had some Bluetooth issues, but like I said, it may not have been the phone.
As far as the display - it wasn't "bad" per se - I've seen worse. My complaint was it isn't good enough - especially on a $1000 device.
To reinforce my point, if you put my Pixel 2 XL side-by-side against my 3-year old+ Nexus 6, the difference is mind-blowing. Motorola hit it out of the ballpark with this display. That was what really did it for me.
And for the record, my Nexus 6 also has an OLED screen. Still no burn-in that I can see and that sucker is on, all the time.