The last stealth mission I played was (I think) from the Aeos Affair, and it involved flying several thousand meters out of my way to avoid most of the main mission area, and then getting extremely lucky while trying to dart between gaps in patrols. Needless to say, it was an exercise in frustration. Like a few people said earlier, I think any stealth mission that follows the retail model has a basic flaw in that FS's gameplay doesn't give you any tools to maintain stealth, other than flying away in a random direction from whatever gets near you. And if you are discovered, it's usually either an instant mission fail, or else you have enough enemies descending on you that you'll probably wind up getting killed anyway. (Oddly enough, though, I never had any trouble with "Playing Judas" itself: you can basically fly in a straight line and then sit still, and nothing comes very close to you.) I think it's notable that FS2 chose to turn the concept on its head with "Proving Ground," instead of having you do the stealth thing yourself. It is possible to make an interesting stealth mission, and a few campaigns have done them, but they usually involve thinking outside the box a bit in terms of design.