The more wet the tobacco, the more mute the flavors. There is also a point where it could be too dry to taste anything as well. Then, there is that point somewhere in between that each of us prefers. As always when you talk flavor, it's subjective.
Cigars from Cuba and Nica tend to perform better at a lower humidity. Criollo and corojo tobaccos can easily and quickly soak up water like a sponge. Don Pepin has recommended that most his cigars should be kept at 65% rh. I havn't had any problems keeping any other cigars in that range.
Cameroons, on the other hand, need a wetter environment because of their fragile nature.
