Lots of good goalies have a bad season at some point in their career. They usually bounce back.
There has been much consternation about Jonathan Bernier in Leafland lately. His stand-out performance in the 2013-14 season, where he posted a .923 SV% in 55 games, raised hopes that he could be the long-term starter to lead the Leafs back to contention. The following season saw his SV% fall to .912, dimming those hopes a bit. This season he's posted just .888 in 9 starts, often allowing goals that left fans in disbelief.
The result is that many fans have left their faith in Bernier's talent behind.