The deathsquitos were indeed nerfed once since the Feb. release.

During these last 10 months many people have complained about deathsquitos and claimed they are too powerful etc, but in almost every case it eventually ends up being revealed that the player was not sufficiently geared up to be there and / or already low on HP from lack of keeping themselves properly fed, so OF COURSE the squito is gonna 1-hit them.

When properly topped of with foods and have even decent troll armor, it is possible to survive their attack and killing them is child's play as long as you don't try to run away.