Only super robot styled Gundams.

Or maybe you underestimated the power of a nuke blast. One nuke can flatten cities in an instant... not even massive MAs or giant MSes like the Psycho Gundam can flatten a city in one go.

GP02's nuke really portrayed the massive destructive power of a nuclear bomb... It's not the initial explosion that kills the most, but the heat blast and rapidly expanding shockwave that's the most damaging.

And guess which mecha is this?

Too easy.