He wasn't though, this is pure hindsight speak. Prior to Fleury leaving, Murray was that good. He just fell off for whatever reason, him falling off after the 2017 cup doesn't mean that he was overrated before the cup. He was really, really good when he was still considered a "rookie".
I for one don't fall for that.
Murray having great success leading up to his initial small sample size stint for the first cup was a huge byproduct of him having that success and the team suppressing shots made him (I don't want to say overrated) maybe over confident when the team was that good. They kept that team together for a reason, and maybe a lot of fans were overconfident in him as well that, that was the future of Murray. I've argued this with
@ColePens on the subject before, that, we should be lucky if he ends up no better than Fleury when the team gets where Fleury had to endure like now for many of years. Of course I didn't expect it to be as bad as it has gotten, but the team has taken a 180 turn as well. You can't keep that team together forever, and trying to reconstruct a team isn't always as easy as it came together when JR. first took over. One of the things I noticed of him was his frail looking body, his legs like toothpicks, but he has also had concussion issues.
It's a little of all of the above.
Murray was slightly overrated or fans were overconfident in Murray's ability of his own accord. The two cups are a over used salesman's pitch.
Injury prone.
His Dad passing.
The team's defense is one or two anchors too many.
Confidence in his team in front of him. That is a thing as well, it goes both ways. Just ask MAF.
In the end, it's not all on Murray, all he needs to do is his part and play confident by playing big in his net and not reach for plays. Any secondary stuff shouldn't fall on his shoulders as long as he makes the initial save. It is a team sport in the end.