Free shodown w/ATo

[Nyquiz]

I'd vary my play on a PF raise with that hand in that position, I'd be more inclined to just limp w/ ATs than ATo though. I think you decision has to rest with the button and the blinds. You said they were passive, tight or loose passive? If its tight passive then you can raise here and be fairly sure they will fold more marginal hands. This would leave it at 4 way action to the flop instead of possibly 7 way action with ATo.