Natsu wrote:
Not really, there are some real normal diffs, some easy normal diff and some hard normal diffs, basically you can't know just by looking at the name, there are some hard diff harder than some insanes and etc.
I kinda disagree with this, since people can't look at the actual difficulty before looking the map itself.
Instead, other informations can be a reference how the beatmap would look like.
Star diff would be one major aspect; beatmap score with its length; or perhaps also the mapper name.
But also the 'difficulty name' would be one of the most important information to expect the beatmap.
No such rules or even guidelines would be needed for this though.
More of this would be off-topic ;w;
Regarding the actual topic, I personally think that sentence of "clearly indicating their level of difficulty" is clear enough, since its range is wide enough. It totally allows relative difficulty names, not to mention an absolute difficulty name.
But if users are misunderstanding, a rewording might work better.