I got carried away there. But still, having the Giant Death Robot in there in the first place is just asinine. It's ridiculous, it's stupid, and it shouldn't of been included in the game.
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I hear this a lot, but if you still haven't won by the time you get GDR and expect it to save your game, you might need to re-evaluate your plans. That or actually play the game and experience the GDR for yourself.
The unit is a nice looking allusion to pop culture mechas that for its cost, is underpowered.
As with any Civ game since Civ3, bombardment units in the hands of the human player is what is overpowered or in your words 'asinine'.
As for Nukes, there is no proper counter for them. Bomb Shelters and SDI, where are they?
Nukes are avoidable though. You see the AI move their atomic bomb to their border city a turn before they use it. And generally you learn not to fortify important units in ground zero (city tiles) of border towns of a nuclear opponent. These are not difficult playstyle adjustments to make and 1up means the blast radius will only damage units away from the center title, except for GP and workers, they die in the radius, I lose on average 1 unit (this includes workers and great persons) from the nukes i've received in recent games, some of it due to dumb mistakes and most of the time, nothing important is killed. The only truly damaging nukes are the IBCMswith the greater range, no early warning and the ability to kill everything in its radius. But those come much later and are expensive to make.
As for SDI, maybe it will pop up as a national wonder, but that's a gameplay discussion to be had elsewhere, not in the rants thread. Bomb Shelters were reported to be one of the new buildings in the expansion, but that is likely meant to mitigate general bombard/bomber damage in the game.