What I love most about the second part to the trilogy is the fact that the last third of the movie is played over the events of the first movie. It is just another extremely fun movie and like the first one, it just doesn't get old. They complement each other perfectly. It's pure entertainment.
when hearing how they had to figure out how to make the end of the original movie (that was not intended to be a link to a possible sequel) to kick off a complex and deeply structured trilogy, and make it seem like it was their intention from the start, i was amazed at the talent of Robert Zemeckis and Bob Gale. My favourite trilogy of all time.