Cipher is very unique no doubt, and I mostly make a ranger type class in every RPG, but I never thought it is an interesting or unique one. Beyond the big three (fighter, rogue, mage) I find the ranger to be the most generic. Why do you consider it interesting, I wonder?
For me the Ranger is mostly convenient, because he has the ranged option, is usually a capable melee combatant, has access to medium armour and mostly a companion that makes the start easier.
Ciphers are a really unique class, remind me of the Mesmer class in Guild Wars, not in mechanics, but because it is something new. Chanters are a challenge as well and Druids offer some interesting mechanics with the caster/combatant/shapeshifter layout.
Its the only pet class in the game. It also has far more and better ranged abilities like powder burns, twinned arrows and driving flight. You can give a rogue a bow, or a gun to a chanter but they cant make them shoot twice or spit fire.