For some weird reason, I've always had the most fun playing Turkey. I've never played a game where you weren't allowed to discuss things with other players so maybe that would change things, but it just seems, well, undiplomatic and frankly I want the interaction if I'm going to play this type of game.
I am curious about the whole psychology of going for a draw, but I guess I've just played with people who I or they will curse the sudden but inevitable betrayal.
For those that think diplomacy is a bit slow but still like the idea, Colonial Diplomacy is a bit faster and pretty fun.