Wild ARMs really wasn't revolutionary. The big thing it had going for it was its Western theme (especially since it actually stuck to it for the first couple of games, unlike another series that wanted to do a different genre but lacked the balls to go through with it that shall remain nameless) and a few other specific features like puzzle solving dungeon items.
That said, a JRPG taking a non-Generic Fantasy Anime theme alone was worth the price of admission in those days, and the games are still fondly remembered because they didn't bail on it. Hell, a lot of classic JRPGs were ones that did away with the Generic Fantasy Anime shtick. Earthbound, Illusion of Gaia/Time, Terranigma, Xenogears, Phantasy Stars 1-4, Shin Megami Tensei, Pokemon, Parasite Eves 1 & 2, Valkyrie Profile, Final Fantasy Tactics (not the Advance games), Chrono Trigger/Cross, Megaman Legends, Suikoden and many more.