Just finished a game with Alex and Cathy as neighbours and I've grown to like them...
on Prince. I enjoyed Alex beckoning me to go to war with him whenever I needed to pick up an extra city, then complaining about how great I was when he was unable to keep up.
Cathy was just fun to go to war with. I called war first, simply because my swordsman was stuck behind her borders, and ended up taking a city from her with it. You see, Rome had taken her city down to a couple HP, poised to take it the next turn. After I nabbed it from him, he just packed up and went home. Good Rome.
The other three wars with Cathy, she had better military and started it herself. I'd just, you know, basically sit there picking off her units until I had more soldiers, then charged in, took a city or two, gave her peace, and waited for the next war. Good stuff. I gave her lots of free luxs after I won to show there were no hard feelings, but she didn't seem too happy.
My least favourite neighbour is Gandhi, but again this is on
Prince. In an older game, I decided to go the peaceful route with him as my neighbour. This is a big mistake. I knew he was nuke happy, I just didn't know he would declare war to use those nukes.
And what is it with Gandhi and nukes? He's usually easy to get along with, but every once in a while he ends up taking over most of the map and eventually nuking all his neighbors.
From what I've read, back in the days of the first game, civilizations acted randomly. When they had nuclear weapons, they would always end their diplo greeting with "My words are backed with NUCLEAR WEAPONS!". This became a meme when Gandhi would give a polite greeting followed by that. As a nod to this, Firaxis gave Gandhi a flavour of
12 out of 10 for nukes (meaning that even with the plus\minus 2 flavours, he will still always be 10 for nukes). He is also the only civ, as far as I know, who will actually say "my words are backed with nuclear weapons!" in Civ5 if he's hostile toward you.