This series is ruined by all the "previously", "coming up", competition and bits of previous episodes. If you add in 4 x 5 mins of adverts, the actual content of each 1 hour programme is about 30 minutes. I found it all very annoying. There are 4 episodes and the female presenter wore the same clothes in each one, so either the whole 4 episodes were filmed in one day or her suitcase got lost at the airport. Dan Snow may well have worn the same clothes too - who takes any notice of men's clothes?
Having said that, if you can concentrate on the actual new content, the documentary is very good. I have been to Pompeii myself and there were a lot of things in the programme I didn't know about. It's a pity they didn't film it at a time when the general public weren't wandering about.