I feel dirty.
In our first Pegasus game I grabbed Ellen Tigh and got a "You are a Cylon" right off the bat (the one that sends someone to sickbay). I played it mostly straight, only dumping skill checks when it couldn't be traced to me. I did manage to be mostly useless, and even "accidentally" executed someone for being a cylon. But in the end I stayed unrevealed until New Caprica and the instant the Galactica showed back up I grabbed the admiral position, hopped aboard, and left all the humans behind.
I won't be doing that again. It was a victory, but it felt cheap.