Well, it may not be dynamite in combat, but mechs do have a solid use in the millitary. Infact, they are already developing these to use these. http://www.youtube.com/watch?v=cNZPRsrwumQ Its a quad-leg robot that can carry 400lb payloads and no, it does not fall over. Even when someone kicks it, it stumbles a bit and regains its footing (this while carrying 400lbs). This is only the beginning for em, they are implenting light weps and armors to them.