LA: Traffic
LA is not a walking city like New York is. In this case, LA wins for worst traffic. There are cars everywhere at basically any time after 10 A.M. and sometimes even before. And no sugarcoating here: It. Totally. Sucks. You will end up having to use the freeway to even get from one part of LA to another and getting stuck in traffic is inevitable. Oh, and it may be rare, but when it rains, don't even bother. If there's one thing Californians don't know how to do, it's drive in the rain.
[Photo via @mrtuero]