I was done with those in three months in MoP because the gating made me feel forced to. I couldn't spend raid currency or get those extra rolls without grinding a gated reputation with no relevance to me and lowered gains intended to drag that grind out before I was allowed to resume grinding the reputations that were relevant. The reputations in WoD offer over priced baubles in return for horrible grinds that don't even pretend to have any story unfolding behind them making them little more than a waste of time rather than a way to progress your character. Even Apexis crystals feel like an exercise in misery.