"Great for history buffs"
Very long and detailed, but well narrated. You do have to focus and pay attention, otherwise you'll lose track. Only issue is he tends to skip around a bit, so sometimes it's difficult to tell which emperor or time period he is talking about. Excellent thesis on early Christianity.
"Garbage"
Written and read like a high school journalism student. Selective use of data to back scenarios. Leaves out details that would contradict. It's already 2012 and a lot of the predictions made haven't happened.
"annoying"
the narration is annoying both in tone and attempt to duplicate L'Enfant's French accent. And the author's observations are plebeian.
"Expertise"
Need to already know Vietnamese for this to help