As far as story goes, I'm completely happy with Back to the Future. They're doing a fantastic job and it's really interesting to see young Doc. I would however like more scenes between him and Marty that aren't just Doc waiting around in the square for something to happen.
It's widely documented on the forum that the puzzles are too easy. Having practically items drop on the floor in front of you isn't a puzzle. Having numerous characters tell you what to do isn't a puzzle. Unless they're finding it difficult to come up with inventive and interesting ideas there's simply no excuse when there's a hint system built into the movie... err I mean game.
I'm hoping in future episodes they might also demonstrate a little of the gameplay mechanics they're using in Jurassic Park. Not too much of it, just enough to create a little tension. For instance, if there's another chase scene (which surely there will be) or some instance where Marty is racing against the clock to get something to Doc in time, the QTE control method would be perfect.