Well, here's one trick to deal with them. Most of the time, if there's a buch of them, there's a partial invincibility close by. If there's a few, you can most of the time hide behind a wall, come back out and shotgun them.
The rig for the legs is interesting and all, but the "brain in a jar" concept is done to death and, as such, I'd much rather see more of the little soldier standing next to him who looks so original. If only this were in higher resolution.