I will make it short and spoiler free.
I thought that this anime will be brainless driving action, but i was very wrong. It had much more elements than i expected and you have more than just one main plot. This is one anime which has perfect synchronization with music. Now whenever i hear music from anime i feel same emotion that i felt while watching and it is great. It is not perfect anime but i highly recommend whether you love cars or not.
Plot is simple but good enough to keep you on guard till the end. While having main plot, u have some side story which makes tension go away for a while. And it has tremendous amount of detail when it is needed.
Of course, character development is strong in this one and it goes trough 5 seasons, not as Haikyuu but still a lot of character growth.
Songs are just perfect for anime. Animation could be better but hey, it is old and despite being old it does more than a good job.