The first episode I found really difficult to watch because it felt too much like real-life (Uber, especially.) – there's one episode which I didn't finish as it just didn't interest me, it was the army-type episode, I got bored incredibly quickly. The last episode (which is set on Twitter, I suppose) is incredible.
I think there were maybe too many episodes, the VR episode, whilst good, just felt like filler to me, though it made me phone my mother. I'll watch the fourth season, it's still one of the better shows on television.