Orcs or what not are fine as long as you don't randomly have exceptions making paradoxes of lore. No one has a problem with gnolls because they don't have threads tying back to humanity. If it's an unredeemable force of evil rather than a victim of some god's anger issues it's fine.Orcs. As people here demonstrate, say you use them as written and you risk getting dogpiled for being racist. But how else can you use them? The default seems to be the "noble savage" being oppressed by them mean old humans, which is a cliche in its own right at this point. Or the insipid and bland route where they're just green humans.
Drow. Much the same as above, just too much baggage on the one hand and utterly defanged nice-guy drow on the other.
No verbeeg (running RotF). Kind of specific, but frost giants are right there if we want giants, and I want giants to stay rare and impressive. Also, no chibi mind flayers.
Eberron did a good job for the most parts with a focus on region/house over ancestry.