Lol @ five carries in the opposing team.
@de.das.dude
drow like bloodseeker is also another good carry to pick early game on, because no one really cares to shut her down. her farming / damage is pretty high on, especially with the crystalys. I guess the same could be said about anti-mage but AM requires a bit more farm and is not as useful in in early game fights.
As you go up, and you insta-pick drow, you will see people reacting and counter-picking heroes likes Nyx Assasin, spirit breaker, nightstalker just to shut drow down.
Drow was actually nice and not well noticed until icefrog buffed her up a few patches ago and she went straight into the spotlight for months (as being one of the most played and hated heroes), then she got nerfed again - the result being the majority of the player base being aware of the threat of a free-farm-drow.