So it seems Galciv 3 got the 'Spiffing Brit' treatment - basically finds an exploit and just breaks the game with it. As it happens the exploit seems to rely more on breaking the game by slowing the game right down, rather than exploiting some dodgy/leaky game mechanics, so that's gotta be a positive!
I'd be interested to hear what the devs make of it? 
https://www.youtube.com/watch?v=0zz2ZnhBe0g