I, too, a missing the hoverboard or the flying car that Back to the Future II seemed to promise us, but all-in-all I prefer our 2015 to the 2015 predicted in the movie (except that I would have liked for the Cubs to at least make it to, if not win, the World Series). We have made great advances in the past thirty years. They might not seem so extraordinary to us since we've been on their journey of development, but so much of what we use every day is greater than anyone in the 80's could have predicted.
There's something about reaching a day that was predicted in a movie or book from the past. Today gave all of a chance to look back over the past thirty years (or 26) and see how far we've come, and how far we have to go. It gave us a chance to measure ourselves against our expectations. I would like to think that we've done quite well.
If nothing else, I'm glad we were wrong about the "future's" fashions.