The problem with Luongo right now isn't that he is a poor goaltender; everyone knows that he isn't. The problem is the stigma that comes with him right now. There are a many people out there who feel he is soft or fragile, mentally. There are many people out there who feel that his play is sub-standard in REALLY important games.
I am not saying that it is true that he sucks in important games, or that his mind is weak, but I definitely think that there are many out there who DO think that is true. Who wants a goalie who will play well during the regular season, but will choke in the playoffs?