They are fast, they hit fairly hard, not to mention they can damage you at anytime in their attack animation. They are pretty much shadow damage glop drops at a much faster speed.
With no elemental bombs (that do damage as reliable as DBB or Dark retribution) chittering burrows are easily some of the more dangerous compounds.
When a horde of scarabs all fly at you, you can only run or die. They are like bullets that can hit you, not disappear, and keep hitting you.
Short of a 4 man team of deadshot or shadowsun sets with Argent peacemakers I don't feel safe going in those compounds.
Please nerf the scarabs, they are just too much to deal with.
What about a 1 man team with a DBB?