I've made a Roman Empire campaign that consists of a lot of writing I did myself. I love roman history and put tons of details into it, including assigning domains and portfolios to roman gods (the more important ones, not the stupid domestic ones). I've figured out ways to keep the players on their toes even though most of them can quote the book from memory, which was quite a feat.
My new problem is that no one is taking my bad-ass theme seriously, and aren't bothering to learn about their environment. I pretty much expected this from one of the party members because he's very casual. But my good players and party leaders that actively engage the party in role-playing to some degree just aren't diving into the content. They wouldn't even notice it was roman if it wasn't for the -ius they jammed on the ends of otherwise normal names.
I'm doing flavorful description when I can, without going more than two sentences for the most part. Longer than a few sentences and it gets a little long winded. The players are having a blast from the looks of it. We're now 4 sessions into the new campaign, so I don't know if I'm expecting too much too soon. I was hoping that the players would notice and indulge in little things (food, sayings, etc) from the overall culture, and that the cleric would explore the pantheon a bit more. It's a pretty cool pantheon.
Long Text Wall Made Short: How can I get my players to engage in the authentic roman atmosphere I've created?