I would say that the first episode or two are the low point of the series. Yes, the portrait of the Getae is all wrong, and the Tracians are carrying the wrong gear, and so on and so forth. Things improve vastly when the action centers on Capua.
There's one other massively ahistorical plotline, but I forgive them. They get enough right for me to be generous.
And as Martok indicates, if you are put off by truly gratuitous sex and violence, you'll have a hard time appreciating the rest of what they have to offer.
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