There's a weird stat called expected saves, meaning would-be goals that the goalie is usually saving basically. Mrazek was 9. Ned was 14. Reimer was in the negative. Lol.
They're all good goalies, Rod stuck with the hot hand in Ned. Mrazek has the experience but he's not as explosive after the injuries.
Here's a good playoff stats run down on goalies, just to put it in perspective.
Goalie isn't something that's easy to look at and know exactly what a good goal and what a soft goal is for most casual fans (took me watching since 2005 and playing goalie in NHL15-20 to really grasp it, honestly). Ned is playing very well. Could be better, but he's 25 and this experience is either going to make him become a league great or he'll wilt.