You mean buildings and policies? The odd 15% boost here and there doesn't compare to just going on rampage. Population is still the biggest factor in science. Ignoring unhappiness and using the crate loads of gold you get from all those TPs to buy everything you need is by far the fastest win. That's exactly my point - you can't rampage in Civ 4, you have to expand then go the builder route for a while until you bring everything back in to line. With Civ 5, since war weariness is not a factor and there's no foreign trade, there's no reason to stop a war. Of course, even if all that is fixed, the game still remains terribly boring for a builder player. There's nothing to do but keep clicking End Turn till something happens - even when you get a decision the choice is obvious. I just start my wars out of sheer boredom.