Interesting,I will pich in. It's fast, but:
1. AirDrop stopped working. Tried restoring cleanly and it still doesn't. Tried clean OS X and it still doesn't. Tried with other devices on different wifi networks. Completely broken.
2. Night Shift Sunset to Sunrise option is gone. All location services are On.
3. Hotspot broken again.
4. There is home screen stretching and squeezing when call bar or hotspot connection i active. The dots representing app pages go down behind the dock and then back up again. Wasn't in 9.2, but appeared in one of the 9.3 betas.
List goes on.
I have a 6S and 6S Plus, and am having none of the first three issues you mentioned. I was able to air drop photos between the phones, and a Mac here at work. Night Shift settings are fine, and the hotspot works. Hope you find a resolution to that.