I think it's because they all suck. They really dumbed everything down so not much is engaging all that much. Seeing a pattern of level job to drop job to level new job and you just get burnt out on it since you have no real identity outside of do rotation and use utilities. A lot of jobs are much more fun in PvP and I hope a lot of what makes the jobs fun there funnels over next xpac.

If you want something Lorewise then it's going to be Warrior > Dragoon > Samurai > Dark Knight > Paladin given the cinematic expansion trailers.