Sorry I'm late to the party in regards to my scoring system, but here's an explanation as there's more logic to it than Tyche is giving it.
Here's the entire scoring system:
First off, Aki, I didn't just mash numbers in... I calculated the average number of yards per each position and that's how I got my numbers. I used to work in market research so I'm pretty well-versed in statistical analysis.
Passing:The point of the passing scoring system is to reward the good quarterbacks and punish the bad ones. How many offense in the NFL are successful with a crappy QB? Not many. It should be the same in fantasy. If your completion % is high your team -usually- will put up some points (there are some exceptions). Also the INT penalty is fairly steep so it helps to penalize some accurate guys who make big mistakes... turnovers kill teams in real life and they should in fantasy as well. People have scored 50+ points with their QBs before, other more than -10. Jamarcus average -3 ppg last year.
Rushing:To what others have alluded to, running for 2 yards per carry isn't helping your team and you shouldn't be given a bonus for it... so for anything under 2ypc you lose points and anything over you gain points. I also scaled the rushing yards by position because WRs especially are known for having a stupidly high ypc thanks to reverses and trick plays.
Receiving:I used to have a yards per catch system but I scraped it in favor of a minuscule ppc system. To add value to TEs they get 1 points for every 3 catches whereas RB/WR gets 1 point for every 4. TEs also get 1 point for every 7 yards gained, WR/RB it's 1 point for every 8.
Kicking:I fucking hate kickers and fantasy and think they are so random, but I've finally figured out a decent way to score them. Essentially the longer the field goal, the more points your kicker receives for kicking it and the less the penalty he has for missing it. If he a kicks a 55 yard FG and makes it., he gets 5.5 points. If he misses, he only loses 0.5 points. On the other hand, if he makes a 25 yard FG, he only gets 2.5 points and if he misses it's -3.5 points. XPs are worthless imo and are only .25 points. Kicking 4 XP shouldn't hold the same value as scoring a passing TD, that's just retarded.
Defense:The average number of offensive points allowed in the NFL per game as of 2009 is around 20. So I give each defense 19 points when they start the game and for each offensive point they allow they lose a point. They can gain points via sacks, turnovers, etc but like QBs it really separates the good defenses from the bad ones and places a high value on having a decent defense, just like in real football.
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Here were the top 10 scorers in my league last year (points per game):
1. Chris Johnson - 30.7 ppg
2. Drew Brees - 23.2
3. Ray Rice - 22.8
4. Adrian Peterson - 22.3
5. MJD - 22.1
6. Aaron Rodgers - 21.8
7. Peyton Manning - 21
8. Frank Gore - 20.9
9. Matt Schaub - 19.9
10. Phillip Rivers - 19.7
A fairly accurate list of the top NFL players last year if you ask me... highest WR is Andre Johnson (17th), TE is Dallas Clark (29) and DEF is NYJ (34).