Legitimacy depends on your definition of what the game is about
If you believe it's about beating an opponent fair and square, and having a little honour and common decency, then I believe it's entirely legitimate. After all, even real wars have rules (Geneva Conventions anyone?).
If, however, you believe that the game is about using any and every tactic that a mind can think up, then maybe not.
Not that I'm prejudiced or anything
~
EDIT: On an unbiased note: at a point with many mech hits, a larger hero won't make a difference anyway. Addtionally, 1 or 2M troop kills against someone defending with a poli hero, or a much smaller hero than that used by the attacker, are still considered to be legitimate bragging proof, so if you ratchet up the hero on both sides, what's the diff?
Bookmarks