Broken Base: And how. There are many fans who absolutely despise the changes wrought by From the Ashes and do not consider it canon, or otherwise dislike other parts of the setting, such as Expedition to the Barrier Peaks.
Evil Is Sexy: Graz'zt, Iggwilv, Eclavdra. Maybe Mordenkainen if you go for older guys. (Although Mordenkainen isn't really evil; he just does evil things sometimes.)
Fanon Discontinuity: Many fans hate From The Ashes, as mentioned above. Name something that's set in Greyhawk after Gary Gygax left TSR and you'll find someone that hates it and doesn't consider it canon.
True Neutral: In earlier Greyhawk stories and adventures, a lot of emphasis was placed on some characters' obsession with preserving the balance, especially the archmage Mordenkainen.
Unfortunate Implications: The description of the Rhenee--a Fantasy Counterpart Culture of the Roma--as sneaky, manipulative, unreliable, and chauvanistic plays up a lot of unfavorable stereotypes levied against Gypsies in the real world.
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