Mine works fine. As fast as any phone rotates. As far as the shaking to make it change position, I've had to do that on occasion with every smartphone I've ever had. Sometimes it seems the sensor just gets stuck. Its not common for me, and as I said, it's hardly unique to my V10. My note 4 did this sometimes. So did my HTC One etc...
If you go to settings>display and scroll down, you'll see an option to recalibrate the V10's motion sensor. It's a bit of a nuisance at times but better than not being able to calibrate it, not that the issue really happens in my case unless I'm laying down in bed and holding the phone above my head.