I don't want to start an argument over this, but in general I've found that ATM's overseas are much less reliable then they are in the United States, expecially on weekends. I can almost always find a place here to get money, but I've been in places like London, Amsterdam, etc where ATM after ATM was not working, many times just out of cash.

I wouldn't depend on them as your only source of funds, we always exchange some at the booths when we first land if the airport ATM isn't working.