Gilda, as much as you might fight it, languages, even English, change over time. Since a huge number of native English speakers use modifiers with "unique," you have a lot of gall to insist that it can't be used that way. Go talk to a linguist.

Speaking of linguists, thank god there are Wikipedia editors who know something about linguistics and can help sort out what is clearly a load of hyperbole in that linked article.
http://en.wikipedia.org/wiki/Koro_language