I bought this when it was discounted on PS+. The best way I could describe the gameplay is that it's a little bit like L.A. Noire only without any of the driving and action. You do a lot of interacting with other people and dialog trees, which end up coming off more as multiple choice questions than the lie/truth dynamic in Noire. You also don't have to worry about consequences of failure in BTTF as if you get it wrong, you can just choose a different response.
But what can't be denied is that they put a lot of effort into getting the game to feel like a continuation of the films, though the story does kind of fall flat in the final two episodes. Still, there's plenty of callbacks to the trilogy, and some of it is just plain funny. I might pick it up again to get the platinum and to free up Hard Drive space.