@Matt_Aufderheide yeah i know the bot is hard i can only just beat him myself, heres a little tip go find the weapon that shoots them little plasma balls and hang around in the open area there and wait for him to come to you..

When he decides to show up, nearly all the time he will come into the room with a rocket launcher (thats like his favourite weapon) and then just unload every thing at him with the plasma gun while still dodging his missiles.. i found that handy to just get some good kills in on him..

Also you can grab the shotgun and when he runs out of ammo he will run away to either pick up more ammo or go get the armour. Thats when you run behind him and shoot him in the back with the shotgun. But make sure that you kill him before he gets to whatever it is hes after, cus once he gets it he will turn around and kill you pretty much instantly :d

Try these to options and see how many kills you can get out on him