Without the Dynamic Event System (Which GW2 didn't start Officially. PSO2 had it before Guild Wars 2. If you take into account the old GW Update that planned to enable Dynamic Events, then yeah, sure, Guild Wars had it first.) Guild Wars 2's only redeeming features that make it different are the art style, plant character playable race, Culling (Which is just plain silly), Weapon-based skills rather than skill trees and total world forced level scaling. Even FFXIV doesn't have that, instead FFXIV makes you scale for dynamic events and dungeons rather than out in the open world.
Perfect World even has underwater battles :V So that's not a redeeming feature sadly. (Lime Odyssey as well if it ever releases.) Underwater battles in GW2 though are a huge learning curve, since these other MMORPGs just use the same skills from the on-land battles. I'll admit, the underwater battles of GW2 are the reason I don't like GW2 (and forced level scaling everywhere.)