This is my list of what I consider to be the ten best robots in Science Fiction. I picked them based on personal preference, to be sure, but also based on their impact on SciFi in general, their design, the mark they made on the shows/games/movies/books they were in etc. While there are hundreds of SciFi robots out there, I submit that these are the iconic ones.
GLaDOS is the ever-present, oh so deceptively helpful A.I. that runs the rat maze you (well that un-named chick you play anyway) are stuck in in the now famously deviously hard videogame Portal. She seems so helpful and benign at first.....Amazing what they were able to do with a computerized voice and some complex and deadly puzzles. The whole experiment is the robot in this case. see more on GLaDOS
Tom Servo, Crow T Robot, Gypsie, Cambot etc. on the Sattelite of Love are some of the funniest robots ever. Sure these co-stars of the cult TV classic Mystery Science Theater 3000 are fairly simply put together puppets, but they are full of personality and 'ornery kid' charm thanks to their great voice actors. While Joel Robinson and Mike are ostensibly the star hosts of the show, these robots steal the scene pretty much all the time. see more on Tom Servo