I love the devil walker, if it has support to flush you, and if someone doesn't make it spin, it can be challenging based on the time limit for public events. It isn't the devil walker that is singly hard, with a solid strategy it's easy, however, keep on mind we were level 8, and the walkers were also fixed for the public event and in the blast location past the refinery. If there was one improvement on the overall approach, it would enemy fallen operating in teams to get you, for the devil walker itself, hard to say. It isn't so much the leg that's weak, in my opinion, any armored walking thing like that could be weak at the leg joints, and I'm not sure about the core popping out, although that makes good gameplay, I can't offer a logical reasoning behind the cause other than some kinda self repair or "dumb alien design". It still has fire power, and AOE.