https://bitcointalk.org/index.php?topic=972120.msg10616458#newDecentralized exchanges will never work
"So, every now and then I see a post about the beauty of a decentralized exchange. Well here's the thing. You can't get USD on a Decentralized Exchange, adding new coins to trade will always be a headache, and since there won't be any censorship, scamming with new, random, 2 day old altcoins will be abundant, among other things
Decentralized Exchanges sound good in theory, but in practice it just isn't plausible."