That's what I meant.I don't think they're finding out that it's not as good as it looked. More likely they are finding out that simple expertise by itself is kind of bland and doesn't really have a ranger feel to it, especially if every expert class has it.
Not that it's bad. But that in actual play it doesn't actually do anywhere as much as the hype. So you are left with just blandness.
Much how Hunter's Mark without concentration sounds good. But the ranger class isn't built to really utilize nonconcentration buff because they lack both the spell slots and spells (in the PHB). So you quickly drop down to something bland.