Yes but humans appeared in other movies where they said stuff that wasn't handicapped. The Gungan race only appeared in episode I, where everyone with lines were handicaps and they got spanked by one of the crappiest armies in existence; II, where admittedly they didn't do anything; and III, where they were manipulated like a complete chump into handing the keys to the galaxy to a tyrant (or maybe that was II and they didn't do anything in III). They're consistently idiots across the mainline movies, only barely being redeemed in supplementary material.