"Well, if droids could think, there'd be none of us here, would there?"
--Obi-Wan Kenobi, in Star Wars Episode II: Attack of the Clones
"The ability to speak does not make you intelligent."
--Qui-Gon Jinn to Jar Jar Binks, in Star Wars Episode I: The Phantom Menace
Droids in the Star Wars Universe are intelligent by just about any current cognitive scientist's criteria.
And implying that a Gungan is unintelligent? Well, that's just bigotry, isn't it? As annoying as Jar Jar Binks is, to the viewers of Episode I as well as the Jedi in it, his speaking ability reveals an intelligence that 50 years of AI research has yet to surpass, and certainly qualifies him as an intelligent creature. Maybe not Einstein, but definitely intelligent in the broad sense.