First, stop speaking for other shaman's, not everyone hates Earthquake.
Now actually think about the spell. There may not be many times in pvp to use it, but it can shine it pve. For example the bloodworms on the VDW fight, they can gib a tank pretty quickly, but with earhquake you can knock them down, potentially lowering the damage the tank takes. This isn't just an aoe ability, it can be used defensively in pve as well.