After seeing the first few episodes online, I wasn't too impressed either, and I didn't really go out of my way to watch the rest until my non-Romanophile friends raved about it and wanted to know more about the historical background. I'm glad I watched the rest -- it was really fun. That said, I can't wait for Crassus to show up!
Yep, the series definitely got better as it progressed. For me, it started getting good when Batiatus was introduced, and got even better as we saw more and more of Batiatus. I liked Ilithyia too, because she was just such a loose cannon of a crazy bitch. You never knew what the hell she was going to do next.
-- Nephele