True. Then again, robots don't have Aura, or Semblances, and as per genre conventions they mainly employ the tactic of wave spamming the enemy with numbers, which leaves them a tad outclassed compared to the Beacon folks. The main reason they're used it probably because you can build them in large numbers, they never retreat, they don't feel fear, and they don't take as much logistics compared to a human army. 

But yeah, they're gonna get wrekt like all of Juniors mooks when the time comes.