Hmm - I don't think it makes sense to declare a fragrance underrated. An overrating is easy to flesh out. For instance the LUTENS line has become overrated alone by being too proliferate. The frequency by which new scents are sort of "generated" is a contradiction to the lines image to be idealistic / elite / artisan / artistic. CREED is as mainstream as Disney with obviously literally exclusive prices - which eager persons wish to circumvent, only to find themselves disapointed eventually - and not so much more.
When it comes to underrating You most probably will find a much longer list of fragrances. Everyone will have a scent that appeals to her for very personal reasons. This will give rise to the idea it should be more respected by others. I easily could name a few.
For instance Givenchy - Insense (not ultramarine): marvelous for technical perfection and too because it fits a certain desire. To result in a gentle alloy with male body odor makes it just a very pleasant accessory. I do rate it way above any (literally) "niche".
Alas, in consequence of me hyping it prices in Europe exploded in the last months, but I've stacked up before 8-]