The game I just mentioned in my last post was using a modified version of the Fate system. I have a quick observation on the mechanics.
We used a strange 2d6 roll instead of Fudge dice. One d6 was a positive die, the other negative, so a roll could range from +5 to -5. You add your aspects and skills to that. I've seen this mentioned as an optional rule in other Fate products.
Thing is, getting a +4 bonus on a skill is pretty big investment on your character sheet for a starting character. Which meant in an opposed roll, the guy who spent everything on this given skill might roll a total of -1, while the person who has no skill in it gets a lucky roll and +5 total. That's just really swingy. Not horribly broken, but yet, it made it feel like our skill specialities and character niches didn't really matter. Next time I play Fate, I'll definitely argue for the Fudge dice version.