I don't really see the problem with the difficulty to be perfectly honest.
Some of you are comparing BTTF to Sam and Max, but it's not perfectly fair.
Sam and Max's puzzles (and Monkey Island's and Strong Bad's) tend to be fairly weird. You have to think outside the box to beat these games. Not with BTTF.
BTTF's puzzles are more straightforward. They make more sense. And that's really because of the franchise.
Sam and Max/Monkey Island/Strong Bad are "cartoony". BTTF is "realistic" (nothing to do with the artstyle, I'm talking about the universe). Therefore, the puzzles in BTTF are "realistic" and easier.