Overall this episode was fine as a I want to catch up but can't be bothered to see the series. No idea why someone would do that in the first place. For those who have seen the series up to this point, there was no new awnsers and no new development, simply only a summary of what we already knew. Most of the times it was just scenes from the old episodes which made it dull to watch if you already watched it although for someone who have not watched it could be a good debriefer as little as I think that is either wanted or needed.
As for the raitings, it is hard to classify them as they are basicly from the main story.