Gibson has definitely been mediocre in the playoffs so far. He just hasn't shown the ability to take over a game like Rinne or other elite playoff goaltenders. As effective as he was during the regular season when healthy, he's been one of the worst netminders in the postseason.
Hopefully as he gets more experience he can also gain more confidence, but he's probably the one I'm most concerned about as we go deeper into our run. Especially with how bad he's been against Pittsburgh in the past, I just can't see us getting past them (if we get that far) unless he has a major turnaround.