A Brief Overview of the World of Darkness System:
First of all, let me say that I like the World of Darkness RPG system a lot. It has an extremely flexible and elegant design with a very simple basic mechanic. Roll some number of ten sided dice and if any of them come up eight or higher than you succeed. If you roll multiple dice with an eight or higher, then you succeed more. For instance, you might do more damage to that monster that is trying to gut you and your family. Another example might be that you're argument is extra persuasive and not only gets you past the guards, but it also makes the soldiers there more friendly toward you. For each ten you roll, you get to roll a bonus dice for possible extra successes.
To determine the number of dice that you get to roll, you add up all the values of factors in your favor and then subtract the values of factors that work against you. This is nice for players that aren't particularly good at math as all these numbers represent amounts of dice. A player can use the physical dice to add together bonuses and then remove dice to represent penalties and roll the remainder.
For an example of a typical dice pool, take the example of getting past the guards. First we have your character's relevant attribute (attributes represent general areas of ability which everyone has), in this case will say the relevant attribute is manipulation and that for this character it has a value of 3. Then take the relevant skill score (skills values represent more specific training) which will probably be persuasion, and we'll say it has a value of 4. Finally, the character is wearing a nice suit, which is worth 2 more dice. Penalties are simply that the soldiers have been ordered not to let anyone in who doesn't belong which we will call a -5. So the player takes 4, 3 and 2 dice for a total of 9, then removes 5, and rolls the remaining 4. My mother could do it! (In fact, she did. I got her to play Arkham Horror with me and my dad over Christmas, which uses a similar system.)
Since all these values describing your character range from 1 to 5, you get to record them on your character sheet by filling in dots. Furthermore, other aspects, such as hit points and speed, are largely determined by adding together attribute values. The system is simple enough with regard to character generation that it's possible to make a character in as little as ten minutes.
That said, there are a few things about World of Darkness that don't work so well, and my game group often finds itself trying to house rule around them. However, after years of playing, I find that the collection of house rules we've used are still less than satisfactory and, since no ones been writing them down, they've also been a little inconsistent. For that reason, I went through the World of Darkness core book (and only the core book so far) and made an attempt to enumerate all the major problems. My end goal is to use this list as a starting point to construct a more formal set of house rules, which will likely be made available through this site when finished.