Overdone!
Given the amount of info available on them and the time they've been around, people think about how unrealistic their society is much more than they used to. Every drow is an evil sadist at best (there's no way a good-aligned drow could have even survived to adulthood). Drow wizards will accept lower payment for casting spells on a priestess' minions, not because of her Lolth-given authority, but because the recipient of the spell suffers great pain, causing the wizard's juices to flow. Drow are so reviled that if children see a single drow in Icewind Dale, they will freak out and tell their parents... the stories are so common everyone knows what they look like, even though there hadn't been any drow in Icewind Dale up until that point.
And of course, drow flip out and backstab each other all the time. An encounter with a group of drow becomes an encounter with one drow, as all the drow backstab each other as the PCs approach... silently. If the PCs even notice, they'll find several professionally killed drow and a single wounded drow offering to sell out his people (detect thoughts will indicate he's unsure whether he wants to or not, but will definitely sell out the PCs).
Obviously I'm exaggerating here, but only a little. Other than the last example, these are all things I've read in books (exaggeration in the sense that the drow are usually saner... slightly).
I've never been in the first "drow" adventure, but from what I've read it was actually an adventure against giants, and so the PCs would be surprised by the fight with the drow. The drow had many advantages (longer-range infravision, the ability to communicate silently, the elven surprise bonus and magic items that help with stealth [perfect for setting up ambushes], knockout poison on ranged weapons, generally had class levels and spell resistance) and once you killed them and went back to the surface, you lost most of the treasure you got off them. Fun... for the DM! For the players, maybe once or twice since they're fighting an outside context villain.
However, drow are so well-known (see the example about children freaking out, they're well-known in universe to people who have never been to the Underdark or even been adventuring) that any adventuring party going into the Underdark will be prepared to face them. So instead of a surprising encounter, it's a ho-hum standard Underdark encounter.
