Robotnick

Many movies that feature robots with artificial intelligence often make the robots look very metalic and robot-ty. For example, C3PO is vaguely humanoid, but his mouth doesn't move and he is made of metal. R2D2 is a garbage can on wheels. The robots in I, Robot are humanoid and have nearly human faces, but they are obviously robots.
Other robots are presented as looking entirely human on the outside even though they are not. Data from Star Trek the Next Generation looks human (completely white, like he was an albino, but still human) and some robots in the movie Screamers (based on a Philip K. Dick short story, in case you were wondering) were basically indistinguishable from humans.
My question is, would it be easier to accept these creations as being intelligent and nearly human if they looked human or if they looked inhuman. C3PO has a personality and isn't looked upon as though he were a simple machine like a computer or car. He is treated as a person. But I am wondering if that would be hard for people to accept because he looks so inhuman. Would people reject him or find him disconcerting because his face didn't move and he was made of metal?
And conversely, would people find it too easy to accept a robot like Data as being a person and having personality because he looked so human. Would he get respect that he did not deserve if he was less sophisticated than C3PO just because he looked more human? What are people able and willing to accept?
Do I have too much time on my hands?