[quote=ASTA]
Standard reactive armor uses slabs of explosive sandwiched between two plates of metal. When a projectile impacts this unique armor, the explosive detonates, causing the plates to force apart, in turn damaging standard ammunition, kinetic-penetrator rods (the plates break the rods up, as they're rather brittle) and disrupts the metallic jet generated by a shaped-charge. ERA is different. It's a type of armor that works like a giant capacitor, where an electromagnetic current is passed through two sheets of material separated by an insulator. When a round strikes the armor, a powerful current is driven into the projectile, either vaporizing it or turning it into a plasma. It's newly-developed stuff, so its true method of operation is classified as hell as far as I know. As for railguns, shooting that down is a matter of firing a potent particle beam at it or firing an intercepting projectile at it (like a shell or dart, which would knock the incoming round off course or break it up). This is dipping into hard physics (and thus we're treading into uncharted waters), but particle beams of sufficient power transfer direct thermal energy to the molecules a target is made up of---superheating it if you will. The shell would more or less explode. That or fry its guidance systems if it's a smart projectile and not a dumb one, due to the electronic interference and radiation generated by the beam's impact upon the metal projectile. Hiding works if the enemy hasn't spotted you yet (or if they have, requiring your stealth capability is an option as well, such as using buildings for cover---especially if you're fighting at night). Sometimes the best way of dealing with damage is to simply not be seen.As for the movement restrictions associated with treads, we could go with a hover tank, but those are just flat-out heresy. Everyone knows treads are superior.
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Alright. I'll even the playing field.The guy firing at the tank has the same defensive capabilities as the tank (can withstand the same punishment), and carries a weapon that functions exactly like the tank's cannon. Everything is lightweight, of course, because magic. 

In this example, we call this guy; "Humanoid tank man" - and he can move just as fast, and with as much power, as the tank in question.

How is the tank superior, or even equal to Humanoid tank man?