Thats Freddie for ya.
His regular season and playoff stats when looked at overall are actually decent.
Problem is come playoff time, he can never be counted on to carry a team being lights out and win games if the team has trouble scoring. In this series, Canes even score 3 goals many times but still lost 4-3. And today 5-3 (1 was an empty netter).
On Leafs, the team had trouble scoring anyway for him, but in those elimination games he'd still kill the team and momentum letting in a bad goal. So when that happens it makes it pretty much impossible for Leafs to squeak out a 2-1 win if he could just hold the fort. Check out game 5 Columbus game where he let in a goal basically along the goalie line.