I've only ever spent a few days in Cambodia. But it was enough to see that Phnom Penh seems a bit dodgier than most cities on mainland SEA.
I've read quite a few reports of Westerners getting robbed/assaulted in Phnom Penh. And I realize that some of those casino towns — Bavet, Poipet, Sihanoukville — have some seriously sketchy people.
But what about the less hedonistic places — Battambang, Kampot, Rattanakiri, Stung Treng, etc. Are these places where foreigners get attacked for their stuff?