The buff they from killing bugs makes them INSANLY O.P. they a HUGE Melee buff. They are super useful for beating the brood mother because of the extra damage to bugs and the buff they get from killing the spider minions also tanky.
Absolute godsend for meat runs in caves. Only things that'll aggro up on it are Pirhana, Megalania and (presumably) Megalosaurus. Otherwise, everything else (including Arthropleura and Sarcos) won't aggro. Have at 'em!