It is nice to see players being so engaged in this discussion. :)
I agree with RUFFHAUS that scoring drastically affects player decisions, since the scoring system determines the goal of the game. In my view, WTA/DSS Diplomacy and PPSC Diplomacy are just two different games with two different objectives. Even players that don't care about scoring systems are drastically affected by it, because the scoring system will determine what kind of meta strategies will evolve in a community, and hence will, over time, determine the way everyone is playing.
I disagree with RUFFHAUS that scoring systems are an 'abomination'. In fact, I think that scoring systems are a necessity and I wouldn't want to play a game that didn't have a scoring system. Without a scoring system, the goal of the game is unclear, which will lead players to play different games, and that can lead to frustration. For example, one cannot argue that a 1 SC draw is better than a 16 SC survival if there is no scoring system. The whole notion of 'win' > 'draw' > 'everything else' becomes purely subjective and there will be players who will throw games because they are not playing according to this notion. And even if everyone was, suppose that you are considering to follow a risky strategy that slightly improves your solo chances, but increases the chance that you will be eliminated, too. Should you do it? Without a scoring system, there is no objective way to answer this question.
A scoring system should reflect how a community wants people to play a game, because the scoring system will determine how players will play a game. Hence the importance of having a good scoring system. I am not exaggerating when I say that to me, the scoring system is the most important factor that defines a community.
I agree with everyone who says that PPSC is an abomination. I will not go into details why, since this has been argued countless of times before. Instead, in this thread I have seen two arguments in favor of keeping PPSC as an option and I want to address both.
1) Some people are saying "If you don't like PPSC, just don't play it". I wish it were this simple, but it isn't. By having PPSC as an option, many players on this site will learn not to play Diplomacy, but to play a watered down version of Diplomacy. This will affect the way they play, even if they start playing WTA games and meet me.
2) I have heard people argue that PPSC is the best scoring system we have for games with a time limit. I agree, and I don't dislike games with a time limit, too. I do think this is a very niche application of PPSC, though, and there are easy solutions. For example, why not make a separate scoring system specifically for games with a time limit? Or why not let the game end in a draw instead of in a win when the time is up and design a scoring system for that? In fact, since PPSC was here since the beginning, I suspect that the reason that time limited games were chosen to end in a win by the player with the most SC, and not in a draw, is because there was a good scoring system for the former and not for the latter.
Removing PPSC and replacing it with nothing else would, in my view, already be a great improvement to the site. However, I do think that there are some problems with WTA/DSS scoring that could be looked at. I will name two:
1. If you play to win, it is often handy to keep many small nations around. If your win attempt then fails, you are forced to draw with multiple small nations, and you get rewarded less than when you would play for a draw from the get go. Thus, WTA/DSS scoring doesn't reward win attempts enough.
2. If a stalemate line is formed and there are still some small nations around, the solo threat can move back a bit so that the small nations will be defeated. This is known as draw whittling. This is no fun for the small nations that have put great effort in becoming vital to the stalemate. Furthermore, many if not most (!) wins on WebDiplomacy are achieved in approximately the following way: player becomes a solo threat > other players form a stalemate line, the solo is stopped > solo threat moves back to give the rest a chance to eliminate the small nations > small nation(s) get(s) angry and say(s) he/they will throw to the solo threat > solo threat moves to the front lines again > solo threat wins.
I expect players to argue that point (2) doesn't happen that much vDiplomacy. I suspect, though, that the only reason for this is that on vDiplomacy, most players play for a draw since the beginning anyway. And this is, I think, solely due to problems with vRanking. See, if you draw with players whos ranking is significantly lower than yours, you will lose ranking if you play on WebDiplomacy or PlayDiplomacy. Not here. I think this is a serious shortcoming of vRanking (but not as serious as some of its other shortcomings). If vRanking worked better, I predict we would slowly begin to see more aggressive play on this site. But we can discuss vRanking separately.
Scoring systems like SOS and the one proposed by nopunin10did solve both the aforementioned problems of WTA/DSS scoring. They introduce some of their own problems, though:
1. There is no clear point at which the game should end. I have played and spectated SOS games on WebDiplomacy and have noticed that sometimes, games end way too early, even before a single elimination, especially when there are no hidden draw votes, and at other times, games go on for a long time even after a stalemate line is formed, because players are haggling over a few supply centers behind the lines. Neither do I find to be desirable.
2. Small nations that are vital to the draw get almost no points. (At this point, SOS isn't better than DSS, since in DSS, the solo threat can just move back so that the other players can defeat the player that was formerly vital for forming the stalemate line, as I previously mentioned. In SOS, the solo threat doesn't want the elimination of the small nation.)
Quite some time ago I suggested a new scoring system in a WebDiplomacy thread. Since people here seem to be quite keen to discuss this topic, let me do that here, too. My idea is to have a scoring system that distinguishes two types of draws. If there is a draw because of a mutual agreement between players, the points are awarded according to DSS, so every player in the draw gets an equal share of the pot. If, on the other hand, the game ends because there is a stalemate line against a solo threat, the solo threat gets half of the pot, and the other half is evenly distributed among the other players. This scoring system has none of the disadvantages I mentioned earlier.