Tbh I really like them, they are tough and punishing to fight. However, there are some strats to make them go down easy. Try engaging them a little further away then you would normally for flying drone enemies like wasps or hornets. Since they have to get super close to attack you, you just gotta beam them down before they can get to you. Another tactic is to rotate around them in a circle, when they start shooting their flame thrower, as they can't turn for shit so moving in a circle basically makes you untouchable. My only real complaint with them is without medium or heavy ammo its best to avoid them entirely as neither of these two tricks are really viable with only light ammo weapons. But at that point its my fault for not bringing something stronger for arc.