I hadn't thought about it this way, but you're right, nukes are unbalanced and overpowered in the hands of a human, as well as particularly annoying when the AI gets them.I think it's defintely time for some nuke defense. I just finished a game playing as Rome and I should've lost that game but nukes saved me. Genghis Khan had completely taken over the other continent and was on his way to win any way he wanted to, Mongolia was completely unstoppable at that point. I had all the reduce buy cost SPs and Big Ben. Nuclear missiles only cost about 900 gold to buy...and I had about 40,000 gold saved up (lots of GAs). So, I just kept on rush buying nukes and completely destroyed all of his cities. The entire continent was a smoldering, radioactive wasteland.It was fun at first, since the AI often builds 3 cities in range of one nuke, but it felt like cheating when I won.
Surely there's not much skill in buying nukes and then obliterating armies and cities until your score exceeds your target's, or you meet some other victory condition?
Not to say you are unskilled, or that getting to a point where you can do what you did didn't require skill, but once you're there, it's just buy, nuke, buy, nuke, win. Can't be all that satisfying, or particularly strategic at that point.
Nukes take much, if not all the strategy out of the game once you can buy/build them at will.