Lord of the Rings Online had exactly that problem with Hunters; players felt that one of the class trait lines was the "main" line and the others were just supplementary. The latest development blog explains how that issue has been corrected: the developers have given the Bowmaster, Huntsman, and Trapper of Foes lines unique roles and specialties on the battlefield.
The Bowmaster is a stationary high-DPS ranged specialization that requires a steady spot for consistent damage. The Huntsman, meanwhile, emphasizes mid-range mobility and rapid output of weaker attacks. Trapper of Foes fills out the roster by focusing on crowd control and AoE, trading in some damage for more group offerings. Players can start enjoying these changes when the expansion goes live in November.
On an unrelated but important note, players impacted by the game's outage issues earlier in the month have now been compensated via time extensions for subscribers and free Turbine Points for lifetime members. It's not a class revision, but it's certainly a welcome bit of recompense.