kite the little guys, they do more damage based on the targets armor (ie don't tank them)
nuke the scrap bots (saw blades are ouchie). tank the biggest guys away from the main raid (1 tank, 2 healers) their jump has a maximum range of 60 yards. if you are in melee range, they won't jump+stun.
so kill order becomes Scrapbots -> Spider tank things -> little bastards -> big dudes.