Robot: Lt. Commander Data from the television series, "Star Trek the Next Generation"
Overview: Designed and built by Doctor Noonien Soong, Data is a sentient android who serves as the second officer and chief operations officer aboard the starships USS Enterprise-D and USS Enterprise E. His positronic brain allows him impressive computational capabilities while his android body is many times stronger and faster than a human body, making Data capable of some amazing physical feats.
Pros: Data's amazing capabilities are in stark contrast to his naiveté regarding the nuances of simple human reaction. Data's search for understanding on matters such as humor, friendship, family and love make for very enjoyable storytelling.
Cons: The damn "emotion chip." Every time Data slaps that bad boy in he becomes immediately unlikeable.
Reality Check: Data is a compelling character and utterly believable as a prediction of robot/android technology a few centuries hence, albeit a bit optimistic. See: Cyberdyne Systems T-800.
Rating: 9 out of 10.
Bonus Feature: One of my favorite scenes; Data playing poker with some of the greatest physicist of the past...