Translation:However, that expression is often of little use.
So, when someone says this, how do we know if they mean it is useful or not?? Because the two translations means two different things in English...
"souvent peu utile" = often of little use that is an euphemism, meaning the same thing i.e. nearly useless.
The two Correct Solutions given are in contradiction of each other. More importantly, translations such as "rarely useful", which correspond to one of the two, are not being accepted.