I love this show, but as others have stated, one of its biggest flaws is how repetitive it is. From the way they describe the objects, to the adjectives used to describe the "sinister" plots or "daring" plans, to the way they film dramatizations of events.
But my BIGGEST problem with the show is that 90% of the time the artifact shown has NOTHING to do with the story told other than being the same object. For example, the story might be about a treasure found at sea, but the artefact will be some random coin in a currency museum that wasn't in that treasure and wasn't even involved at all. It's just a coin similar to what was found. I just finished watching the episode about wine bottles etched with the president's initials using a dentists drill. But the artifact that they use was some random dentist drill from some museum that has never had anything to do with the story. Like this would be interesting if it was the actual drill used, but instead it's just some random drill that happens to be similar to the one used. The show is called "Mysteries at the Museum", not "Mysteries Told with Random Objects at the Museum"
