I don't think you can write-off Lack just yet, he has shown promise as a backup and is still just a rookie. Those expecting Lack to be given the starters job and continue giving the Canucks elite goaltending were way off base (Gillis included) and this has been stated numerous times even when Lack was still the backup here.
The Canucks have given up the most goals against of any team in the NHL since the Olympic break. That means Lack has given up the most goals against of any goalie in the NHL since the Olympic break (basically since he became the starter). I think that qualifies him as the worst starting goalie in the League. BUT, this is what people wanted.
But...he gives us the best chance to win!