Noooooo! I think the human player has a lot to do with how the AI civs react to each other. As the Vikings, the only wars I had was with Portugal (to sink their ships) and the Islamic nations (to sink the ships). (OK I vassalized Aztec and Incan lands too) Everybody (and I mean everybody else) was pleased or friendly with me.
World wars detract from culture building and science points. My 2 centimes.
