Four start because I think they missed the opportunity to add some depth and backstories to some main characters, even if it would have meant added fiction.
Nevertheless, a brilliant film to portray the DNA of Gran Turismo itself on top if a great cinematic production of Jann Mardenborough's story.
As a former gamer and knowing Jann's story, the original trailer made me very sceptical at first, but the actual movie is an exciting piece of entertainment which straps you into the passenger seat for its entire duration.
If you are a former or current GT player, get your tissues ready because a lot here will hit you right in the feels as you will experience many moments a lot more intensely than the average viewer!