I don't really like Nukes in Civ2. The whole concept really just ends the game.
Firstly the fact that everyone can build them once someone builds the Manhattan Project is bs. In a close race where everyone is ganged up against you (and chaeating) its the kiss of death for your hard worked game.
I only uise Nukes if I need to get to a city i just cant breach. But with Howitzers, Stealth Bombers and battleships, there is hardly a city that can't be hit without using a Nuke.
I don't like the pollution it causes, however that can be countered by sending 3-4 engineers with you, it is a pain to clean up, esp if the AI is picking your settlers off.
INSTEAD, I decided to remove the power of the nuke in Civ2. I changed the attack to 50, so it no longer causes pollution and the like, it is just a giant cruise missile. However, I also reduced the shield requirement to about 40 over a cruise missile to make it mroe affordable. So, if your gonna build Nukes they are merely another powerful weapon. But you still need to rely on strategy to win.