Its interesting how, any discussion about AI or robots never misses terminator or "us vs robots" scenarios, but, generally misses the many "not so bad" robots in fiction. I guess, to some extent the more popular the movie, bigger the influence. These fears may not be baseless though. After all, I have heard that most of the robotics/AI research is usually funded by the military.
When one asks questions like, is steel good or bad? It depends on how it is used by us. But, this analogy may not quite work with robots when (and if) they reach the point of matching our intelligence. Then it may not be us, who decide how they should be used. Personally, I think the majority cannot be destructive as, it is not self sustaining. Anything that "survives" the various tests, that, nature throws at it, eventually has to have a majority in numbers of the constructive or the productive kind.
My favorite robots in fiction (and one real).
Image From ShinyShiny.tv
Bender aka Bender Bending Rodriguez
Spirit (Mars Rover): This fellow has been working all alone on mars since January 4, 2004. He surpassed all expectations of him and worked 21 times more, than what was planned for him. Day after day collecting analyzing samples and diligently sending its finding back to us, till he finally got stuck in Martian sand. Last we heard from him was on 1st May 2010. No bleep from him since.