I could see the benefits of a three-party system, but the two-party seems to work all right. Mostly. If we could somehow screen the crap candidates before the vote (oh, hey, wait! That's what's supposed to happen -- whoops) we might yield better results.

Or perhaps if there was a way to better distinguish between party lines and ideals and perhaps find a real compromise, that could work. I don't know; it's all very convoluted.