Iv'e fought one Sectopod... that description of them wasnt lying.
50% damage resistance with Enemy Within! At that point I'd have my sniper run into the arms of a berserker just to get away. I'm all for boss battles but that is just OP. That synthetic son-of-a-b**** just wouldent die, & it didnt help that a Cyberdisc's baby joined in, healing the tank from beyond my range.
Here's a question, if all robotic (including Floaters, there's nothing natural about them) enemies turned on all the biological species of the alien collective, who would win in a all-out war?