It's a tough battle. You can't see the bots until you get through the big doorway at the bottom of the ramp, and by then they are all over you and kill you pretty quick. I snuck one person down on the right side of the ramp just far enough to sight the bots and snuck back up. Then my snipers could start picking them off.
Try targeting their heads to knock them unconscious and bring in a 3 or 4 man hit squad with big guns to finish them off. I have two good snipers but 3 are probably better.
