I feel this movie deserves a fair rating of 10. On this particular topic, maybe a decade from now, maybe even less than that, people are going to look at petroleum-based cars and ask "why?". It is not a debate on whether electric cars work, we should be asking ourselves, why it took so long for us to finally have them. I am baffled by reviews that say this is conspiracy, unrealistic - well 100% electric cars are here, as a matter of fact, they were here before the petroleum- based cars, just do some research or like I did, go to Edison and Hord Winter Estates in Fort Myers, FL.
This is not why IMHO a 10 is not an extreme for this particular movie, it gives the viewers so much reality, on how difficult it is to pursue one's passion and life-long dream, how much stress, humiliation, and hardship they have to go through to overcome a world that resists changes for whatever reasons(stubbornness, money, or sometimes just not being well-informed), to succeed and influence. It opens up so much more for us to question(who's there to conspire for one), to learn and to make better, well-informed decisions when it comes to our own actions.