There really are way, way too many: Yvresse, Y, Dolce Vita, Poison (yes, Poison), No. 22, Aprs l'Onde, Chamade, Ivoire, Jolie Madame, First, just about anything Caron makes...
With the amazing assortment of scents out there and the fact that only a very few get carried in department stores, and even fewer of those get any sort of push by salespeople, and that most people out there choose from a very small selection of fragrances available, I'd say at least 95% or more of scents out there are underrated. It would be much easier and time efficient to ask what scents aren't underrated.