@Razer361 The problem with exo-skeletons is that you still have a soft, squishy human inside it. A suit can handle very high g-forces, such as from moving at high speeds and coming to an abrupt stop, but the soft thing inside it, i.e. the human, doesn't handle that so well. A super-exo-skeleton user such as Tony Stark would in real life be turned to mush by the g-forces experienced by his body, even though the Iron Man suit itself could handle it. Therefore, if you want the 'super-human' thing, it's probably better to replace squishy flesh with nice, durable plastics and metal. Of course, you would also have to replace the brain, which I guess means that the person essentially becomes a complete machine.

The Big Dog has two main problems; it's noisy, making it less than ideal for a patrolling through hostile territory, and its range is limited due to battery size constraints. The Taleban have a much more efficient system - it's quieter, more durable and can live off the land. It's called a donkey.