mad is the wrong word... I'd be extremely disappointed - more so than in 06 or in 98, more so than in any loss I have witnessed as a hockey fan outside the 94 playoff loss, which was bar none the most disappointing hockey loss in my life (as a fan).
The reason why this would be near as big a disappointment is because the Olympics are in Vancouver. My home town, where I grew up, where I learned the game, and learned to love the game as much as I do... In my lifetime, this may never happen again - the chance to win it on home ice - and not just in Canada, but in Vancouver!
As such, if any team but Canada wins, it'll be a MASSIVE disappointment... the last time I actually cried after a loss was in 94... but I could see myself doing so again if Canada loses here.
I'm also taking time off to be there for the entire tournament, and have several friends and extended family flying in, several of who are Americans, so if the US wins, or even does better than Canada, I will never hear the end of it.