Loved Dickinson and Calls, but I will be honest...nothing I have tried on Apple TV has been bad. Calls was a really haunting and different experience. I am normally the type that multi-tasks a show while doing something else, but Calls was the first thing in years that demanded my full attention.
They really seem to be going for quantity over quality. The library is still very small, I can easily keep up with everything on the service, but almost every single show I have watched has been stellar. 1971 is maybe the only miss for me, and that is purely on my musical taste.
I haven't delved into their movie selection too much, I almost never watch movies, but with how good their shows are I may try it out.
I actually cancelled Netflix because, while they have a huge library, it is mostly not very good comparatively. Haven't missed it yet.