Overated imo, specially with how the definition of the fetish itself isn't even respected by the fans of it, calling any mature or caring woman a milf, completelly forgetting the only real condition to be a milf:
>Being a Mother
And then you find a shit ton of characters that never had kids tagged MILF on the site (like Tsunade, unless im missing some Boruto spoiler), while some others who are actually mothers but "lack the looks" are usually never tagged.
I get that nowadays it deformed into more of a mommy-vibes thing, but that just add up to my critic opinion about it.
TL;DR: Overated cause everyone is a MILF to people, except half of the actual MILFs.