It really is. My "holy shit" moment from yesterday:
Me, my friend, and one other were playing Horde on Overpass yesterday. We got to wave 10, the boss battle (every tenth wave is a boss battle), and a Brumak spawned in one corner of the map. We were making our stand in the middle of the map because there's only one way the AI can get to us and we'd have the high ground because it's one long staircase, allowing us to funnel them into one path and making it easier to take 'em out. We'd figure it'd be easier to take out all the other AI before we dealt with the Brumak. And so we did, taking out the other Locust while the Brumak remains stationary in his corner laying down fire on us. At last we take out the final Locust and turn our attention to the Brumak. As we were doing so, the Brumak started marching toward us, up the staircase, leaving us trapped. Many expletives of the Unusual Kind were had, mostly out of shock and horror.
I, fortunately, managed to escape. The Brumak managed to block my other teammates off and kill them. For the next four or five minutes I was playing cat and mouse with the Brumak. I was finally able to take him down with a mortar.
Too bad this game doesn't have a saved films feature.