asimov is coming true with his i robot series. jules verne predicted the submarine and even the country and company that produced them and that rockets to the moon would be launched from central Florida,this was in the eighteen hundreds
For me the most realistic sci-fi books are those dealing with a possible future developement of our society. Often they don't draw a very optimistic picture of where things are heading to. Good modern examples are Jennifer Government by Max Berry, or if you are into computer games Ready Player One by Ernest Cline.