While there are standard templates of expertise that often matches play type (pve, pvp, control, survival, straight up dps) and to some extent the jewelry sets, most if not all professions will require you to choose between equally appealing talents.
For example, the BH can be built around focusing on CC, debuffs, burst and pure dps, or a mix of several, to some extent. Your character's 'build' is pretty much the product of expertise, armor mods, weapon type, and jewelry set. And between those factors, the build options are plentiful. Sure, not pre-cu plentiful, but enough to last you some serious experimentation.