Lets face it at one point or time we've all thought about Time Travel.
Marty McFly was a very fortunate teenager to have Doc Brown as a friend. I know none of my friends are on the brink of inventing a flux capacitor to put into their sweet time traveling vehicle. Imagine rolling up to the Twin Peaks Mall and finding our your friend made a time machine out of a Delorean.
We all know that Marty McFly screwed up when his mom fell in love with him (awkward) instead of his dad, and when Biff got a hold of the Sports Almanac, and when his couldn't start it in the West in the third...BUT Time Travel is still cool. I think Marty just had some bad luck, or maybe he was just a chicken.
Watching Back to the Future we've all thought about where we'd go or what we would do.
A get rich scheme (It worked out pretty well for Biff for a bit) meet some cool people like Jesus or see some cool stuff like Roman or the Wild West.
Back to the Future took a complicated subject and made it fun, and seem almost easy. If someone like Doc Brown can do it, why can't we?