Fun, witty, and mad. This is how a Back to the Future game should be. The return of the cast make this game instantly memorable and further exploration into the universe is always welcome.
Back to the Future: The Game successfully translates what made the original movie great into a fun, challenging, imaginative and funny adventure game that's often a joy to play. Telltale has crafted a loving tribute to the film, then, but this is a loveless port, marred with frequent load times and small presentational glitches.
As a compilation of five excellent adventures, it's hard not to recommend Back to the Future: The Game for Wii. However, given that it's also available at the same price (and in a better form) on PC and Mac, it's impossible to recommend this version over those.
Back to the Future: the Game is a good adventure, recommended to all the fans of the series. Just, if you can, don't buy it on the Wii: the framerate is a nightmare.