The R2-D2 astromech droid from the original Star Wars is a love-him or hate-him character. You either find his cacophony of whistles and beeps amusing or foolish and irritating. Regardless, R2's iconic fate is sealed along with the likes of C-3P0 and the Terminator in cinema robot history. However, as far as plausibility and coolness factor go, R2-D2 doesn't give us much to admire. The usefulness of a walking Swiss Army knife can't be denied, but those tricycle legs leave us wanting more. Thank God the Death Star was wheelchair accessible.