Yes, Marsians are way to advanced technologically for the Terrans to even hope of opposing them.
It might be that Marsians found all of those toys after the war.

An armor that desintegrates anything that touches it... thought about it long ago, I wonder if that one can convert the matter directly into usable energy tough. For some reason, it seems that power is limited to a maximum volume per second of matter disintegration, explaining why he didn't want to use it to follow the vehicule into the underground tunnel.

Of course, that weapon was used on people. It should deal some psychological damage to people witnessing someone dying that way. But it seems that teenager kept his stoïc face for some reason.