Do you know how to read a calendar? That 3-0 score you are talking about was from October 2011. Caps are not a great road team. They would be fortunate to work a draw. ML is a sucker play @ that price.
It's soccer man, upsets happen all the time - look @ Japan over Spain in the Olympics as a sizeable dog. Just given the form home-away of the Caps, I think you'd be better off trying the +1. Much likelier they either lose by a goal and you push or they can snag a draw and you win. Their three road wins this season are all against lower tier teams. Considering their win over San Jose was their first win in five matches and it was at home ... I don't think you can say they are in "great" form. They do though have a couple draws and a couple one goal losses in that span. Just my two cents.