Ya. It is. I only recently became interested in cashing some fraction of my holdings so I tried to get verified. Mt Gox rejected my verification on some pretty bogus reason (my ID contained a P.O. Box IN ADDITION to my physical address as is common in my area.) They either overlooked something or are making excuses to limit withdraws or avoid US customers or something.
...
Just an update in fairness to Mt. Gox:
They again rejected my documentation, but when I pointed out in a rather frustrated note that the docs complied with all of their requirements, they sent positive response. My best guess is that they mostly overlooked the fact that all my documentation actually did contain a street address and my suspicion that they were actively avoiding taking on new US customers is probably not the case.
The correspondence I've had with Mt. Gox's AML team has vastly exceeded my expectations in terms of how quickly they have gotten back to be with both rejections, and with the eventual acceptance.