Some more thoughts. I've moved up to Cripling and am still dominating by using a fairly simple formula: 1] Go for yellow techs and nothing else (this, of course, is rather lazy and could be tweaked to greater effect) 2] Attack a suitable neighbor ASAP (in my current game, this meant taking out the Yor for their nice corner position).
The result of this approach seems to be A] AI is reluctant to attack because you have high diplomacy and a decent army early and B] you double then triple, then (you get the idea) the size of your empire without much resistance. A series of 1v1s of your choosing.
My thoughts on this are that it's one thing to respect a civ because of its high dimplomacy, but once that civ proves ruthless, it should be a common cause to stop it from gaining too much power. For the human, therefore, this should result in needing alliances and/or making for a much harder military campaign as the game gets fully engaged. For the builders out there, as long as they don't go on a military rampage, they could still enjoy peaceful games more often than not and perhaps grab a tech victory. As it stands now, however, the diplo/military approach works too easily.
This isn't anything new. Sirian spoke of this previously and provided nice screenshots. But the issue persists in version 1.2, and I hope Brad can get some of these problems on lock down.