Aggravator is a light rocket bot used mainly To push the front-line towards the opponent’s base. It can out range light laser turrets so if your enemy expands solely with a Commander, Aggravators can force him to retreat. In bigger numbers and with repairing support of resurrection bots they are able to take down more advanced defensive structures.
To protect them use your Commander & Constructors to build progressing defense. In comparison to their Armada counterpart Rocketeers they are a bit slower, but stronger..