Just tried my first game with 16 Civs (rather than the default number) on Pangaea, and it turns out the OP has a point. The dogpiles are insane, never ending.
It was actually kind of fun. I decided there was no way my original civ was going to survive without some Ring of Fire action, so I teched up to AV and switched to Hyborem. After killing my old civ and making nice with the nearest neighbor long enough to spread AV, I went off to manufacture some manes and Armageddon points via razing a few cities.
Which started the dogpile all over again, cept this time I had a big demon and his overpowered troops to guard my cities. Endless waves of soldiers smashed themselves against my gates, and eventually every last single AI that was at war with me surrendered (often give gold, techs, and in one case gold per turn as tribute).
I refused surrender with the weakest two civs, and ran off to raze them utterly with my veteran army. Managed to kill a couple cities, then Basium popped out, and the dogpile started all over again. Except this time it was augmented by monks that demons just couldn't defend against.
Actually, the best game of FfH I've ever played.
Still, the dogpile code is a little insane (though I see it's been adjusted for the next patch) with 16 civs interacting. And monks are a touch *too good* at killing demons.