Since I inadvertently kicked off the forked thread...
Firstly, let me say congratulations to those of you who run "evil" campaigns successfully. Or play in them that don't turn in to the ridiculousness I've seen...
and that ties back in with what I said : I've heard of successful "evil" campaigns - it would seem, given the frequency with which they're discussed in this very thread, that they go on almost to the exclusion of "heroic" campaigns, but I digress...! But I have never seen an exclusively evil D&D campaign "work". I meaning me, seen meaning having been there as a player (do not DM them, do not want).
Every one, to a one, has been an exercise in juvenile sociopathy. I've sat back, said, okay, I'm playing Lawful Evil here, I'm going to be cold and calculating and follow strictures and guidelines and jesu cristo they're burning down the city around me and butchering children for no reason. That's always how it works out to a greater or lesser extent. And no, it isn't "well maybe that was their plan as they're playing chaotic evil and part of what..." no. NO. It isn't. Hasn't been. Ever. It's been "let's get as much blood on our hands and let's do the most horrific things we never get to do like killing children who annoy us and burning down churches and having a race to see who's more 'metal' (or is that 'mental')."
It's two hours of this, who (or I guess I should say what-) ever is DMing laughing during the whole of it, then getting around to "Okay the mission you've undertaken for the Evil Overlord is..." ...and then things cranking right back in to an overdrive version of NATURAL BORN KILLERS.
The closest I've come to one that actually worked was a CHAMPIONS game that involved one character who was a minotaur inadvertently summoned into the "normal" supers world, another who was a "failed" super-serum experiment who also happened to be a violent anarchist after bad experiences during the first Gulf War and subsequent experiments, and myself, a dangerous telepath/telekinetic type ala Tetsuo from AKIRA. That lasted about two sessions before it became "let's run amok in Disney". I left.
I don't like it when people play "good" characters and try to work out their creepy issues, but I think the sick factor is raised exponentially when people of that bent are handed the chance to play an "all evil" game.
(Conversely, some of the less-than-munificent types from Gary's games always sounded like a hoot - Sir Robilar, Erac's Cousin, etc.)
Sorry to carry on, just thought that needed some clarification.