smursh wrote:...Even though you may need as many as twice the number of units as your opponent...
I'd call that 100% defense unless you control 70% of the cities or more.
You're talking about superior numbers overwhelming a single entrenched position. And you've openly stated that the cost greatly exceeds the benefit. If for example it takes 60 turns of production at value 8000 to defeat 40 turns of production at value 1500, I'd call that a 100% defense. The scenario you've analyzed does not at all fit the scenario given. I have (er, had) superior units and deployment. They have complete control of all engagements due to the ability to intercept at 100% deadliness utilizing highly inferior units (low/no cost to their real armies, IE, perfect active defense) and fortified cities with 100% ambush and stacks of medium strength units (total cost of eliminating one city: 40+ mid-high level units; IE perfect defense). Even given your scenario, critically weakening oneself to break one strong point is simply an invitation to utter destruction in any resulting counterattack.
However, against concentrations of troops exceeding 8, they're completely ineffective. In fact, the only thing I can possibly do is play a prolonged stalemate. They can't attack. I can't attack.
KGB, the idea that a stalemate will eventually break after 30 turns of doing nothing is not an acceptable state for the game. All stalemates break. In fact, if I and my teammate use the correct production, this stalemate would theoretically never break. After all, they can't afford to attack (lose those heroes and they lose their edge), and each side will simply stockpile troops until saturation is reached, with the superior macromanagement ending up with a superior army (probably my side, and still completely ineffective on offensive). Given that scenario, the stalemate is perfectly indefinite.