That statement is not even close to true.
Giguere ranked 41st out of 83 goaltenders in Wins in the 2009-10 season. That would put him in the upper half of goaltenders in the league, in that category.
Giguere ranked 34th of 44 goalies in g.a.a. in the 2009-10 season, not great, but according to my math, not in the worst 5.
Giguere ranked 26th of 44 goalies in save percentage in the 2009-10 season, again, not in the worst 5.
Toskala in these categories: 45th (of 83), 44th (worst) , 44th (worst) . Yup, he sucked.
All stats courtesy of espn.com
http://espn.go.com/nhl/statistics