To be fair, its not like even a small percentage of drow in RAS's continuity are anything but Chaotic Evil, we have mention of 2 out of 20,000 in Mezzoberranzan who are not. And Zaknafien wasn't exactly Good like Drizzt, just not Chaotic Evil. So, .001% or something? I think that's okay.
Second, Ed Greenwood is a pretty poor novelist, but we forgive him since its his world and some of his characters are amazing (Elminster and the Symbul, for example). Spellfire was a hard read but I liked the Cult of the Dragon as represented in it (Salvarad was so cool!) and Crown of Fire was better. I couldn't read the 3rd in the series, it was too awful to finish. Elminster in Hell was fun though! Fast and furious read.
RAS is a great writer, by most objective standards (how many NYT Best Sellers now?), Drizzt/Wulfgar/Regis/Bruenor/Cattie/Guenwyvar are icons in the genre and Artemis, Jarlaxle, Kimmuriel, Cadderly are wonderful too. My favorites will always be The Crystal Shard and Servant of the Shard (never loved spending 3 novels in the Underdark for the DE Trilogy myself).
All that said, they don't need to show up in Dragon Age. Please.