The Sectopod is an awesome boss level unit. The first time I encountered one was one of the most dramatic battles I 'd ever had. But now they show up on every other mission!!
They do massive amounts of damage. They get to attack twice per turn. They are ALWAYS ON OVERWATCH!!!! Even on an attacking turn!!! Their reaction shots can hit multiple targets, even characters that aren't moving if they happen to be in the line of fire. And they are IMMUNE TO EXPLOSIVES!!!
I love a challenge, but come on!!