While we love the idea and concept (who doesn't love BTTF??), the game play was way too slow to make this game interesting. If it was, say, Lego BTTF, that would be a lot more fun. As it is, not worth it.
Bound to be enjoyable for any fan of the Back to the Future film franchise. The story, writing, and voice acting are all great (they found an amazing Michael J. Fox sound-alike to play Marty), and it's loaded to the brim with fan service. It's clear that the makers of this game know the source material well, and revere it. The frame rate lags a bit, but hey, it's a point-and-click adventure; it doesn't have to run as smooth as silk.
So, yeah, if you love Back to the Future, then give this all-new adventure a spin. You'll be glad you did.