That's about how I thought it might stack up against its contemporaries. I've wondered before, for the same reasons you mention about taking away the images/sound, if it was just an exact duplicate of some other playfield that had been branded with the BTTF imagery.
So what would you say is a really interesting pinball machine (something where the playfield itself is unique and fun)?
Also, good to know there is another BTTF fan here!