It's still in development. In the past you weren't even able to glance inside the sausage factory. If you want something solid then wait until 1.0 is out, preferably 2.0.
That doesn't sound like a RC to me. I have a general feeling that the RTM standards are slipping massively at MS. Windows 10 was a dog when I tried it - and obviously not finished, VS2015 is very unstable, then the issues above... It feels like stuff is being pushed out the door much earlier than it previously would have been.
I do appreciate the direction they're taking, it just feels rudderless atm.