Yes, and a person watching Star Wars can generally get what R2-D2 is saying by paying attention to the emotional inflection of his beeps and chirps in the context of the scene, but this by no means implies that the proper way to convey the character through role play R2-D2 is to spend alot of time talking.
I mean, last night (as DM) I did a dog barking, and everyone quickly understood it to mean, "He wants us to follow him.", but the scene would have played out very differently and the dog would have had an entirely different character and portrayal if I'd had the dog come up to the PC's and actually say it.