(Disclosure: I'm the boyfriend.)
Man, I remember your telling me about a young Caesar saddling up with Brutus to go after Mithridates, and somehow I just knew it, and you confirmed.. yep, they killed him. In two nights of guerilla attacks. With blowguns. Ok, I made up the blowguns part, but why not? He made up the rest! I regret using the word "rape", but I feel bad for that friend of yours whose only source of Roman history was this series.
I agree with a later poster: choosing figures about whom so much is known is the misstep. If you want to interpret, be lazy, sloppy, or just plain make s--- up, best to pick some back-bencher, not someone from history's front row. What Duggan did in writing about the second Triumvirate was to pick the dull one no one cared about and make him the star.
I remember reading a murder mystery set in the Flavian period when I was in high school, "The Silver Pigs". We should look for that series, since we could use some more context for that period.