Sun Boy had commented on how Amber was awesome because there was no "IQ" stat, you had to use your own intelligence. It goes further than that: there's also no social rules; no "diplomacy checks"; in Amber your own abilities as a player are what determines your social abilities.
Amber is what I've previously called an "asperger-proof game", as in, the autistic lawncrappers and social retards of the gaming world would find themselves utterly incapable of participating in Amber and not having their asses handed to them on a plate. Most of the WW-style "image-over-substance" gamers would, as well; anyone for whom "machiavellian" means "I think up a general idea, spend forty-five minutes talking a lot and trying to strike poses, then roll my dice pool". These people have no future in the harsh brutal world of Amber, where both at the in-character level and at the OOC level your ability to socially interact with the rest of the group, and especially the GM, is key to your character's success.
Its another reason why certain people hate Amber, and why many others absolutely love Amber; because Charisma is the most important attribute you can have to play it, and you don't get a number for that...
RPGPundit