To me, the big advantage of Statecraft in going for a DV is the chance to build the Palace of Westminster, with its 6 votes. Playing a 5-city Tradition Korea, I dominate the WC (21 votes, followed by 14 and 10), despite failing to found, and having just 3 allies at this point. I'm going after a SV, but the advantages of Statecraft should have been critical in this game.
Indonesia is the clear leader, although not quite in the runaway category (2d in GNP and Mfg Gds). I'm 4 techs behind, despite having 1) sanctioned them; 2) banned all 3 of their unique luxuries; 3) decolonized them; and 4) passed the Global Peace Accords. I've also helped stir the pot against them (not that much was needed) so that they are constantyl at war against civs that aren't pushovers. Although I'm too small and share a border with them to DoW and have a chance of winning, I've fought them to a defensive standstill twice. And yet...
They just keep chugging along. Their army is just big enough so that the AI cannot swamp it, and their empire big enough that they pump out gold like crazy. In the meantime, my gold is limited due to my size, and I don't see how I'm going to catch them. (They're also way ahead of me in culture.)
Two points here: things have to go just right for a tall civ to win an SV (as I did recently), as it's very hard to stop an AI that gets big enough to roll downhill. (In this case, it's not even a monster, ahead of the Netherlands in pop by less than 3:2.) I don't really think it's a big problem, since Civ is made for war and large empires; the space created by VP for tall civs is pretty impressive, all things considered.