So...he's like every goaltender ever?
Rarely do goaltenders steal games on a consistent basis, and if the Canadian team is good enough, they don't have to (See: last Olympics). Luongo was never required to "make the big saves" and in situations that, in fact, required him to do so, he failed. (See: Parise's game-tying last minute goal). Likewise, Brodeur's performance in those Olympics were similar to Ward's now. He didn't play great, but neither did the team in front of him. Canadian goaltending ebbs and flows with the strength of the team in front of it.
Why does this happen? Because you've got a group of players that have never played together in front of a goaltender that doesn't know the tendencies of the team in front of him. I'm sure I don't have to tell you how much trust plays into the part of goaltending. You trust that if you give up a rebound, your team will be the first one on it. You trust that they're not going to let the pass through on a two-on-one or turn over the puck at the blueline. A goaltender can only do so much.
As the tournament went along, the Canadian team should have meshed, both offensively and defensively. They never did. We've seen flashes of the dominant Canadian team, but never enough consistency. The only line that generated consistent offense in every game was the Eberle-JT-Skinner line and the only defenseman that was somewhat consistent was Keith. So when you've got a team that plays the QF the same way they played game 1 of the prelims, you're not going to see much success.