I have to say that I have been a fan of Gran Turismo since the PlayStation 1 era, and it made me love racing games in their most realistic form (e.g. Need for Speed), which I find indifferent. Since the Xbox 360 (PS3) era, I made the switch and started playing Forza Motorsport, and ever since, I always saw Gran Turismo lagging behind in everything. Recently, after playing Forza 7 on my Xbox One, which was very good, I decided to go back to PlayStation and try out the latest installment of the series, Sport.
Gameplay: mediocre, as I believe that in many cases, the reactions of the cars (especially rear-wheel drive) are very stiff and unrealistic.
Graphics: very good, although Forza was better.
Sound: bad, maybe I miss Forza again, but you can hardly hear the car's character except for a few exceptions.
Multiplayer: Sport excels in this aspect. It has many modes and official FIA races.
You can't upgrade your cars as you want, only with certain levels that you unlock, but the pure tuning is missing.
It emphasizes the behavior of each driver in the multiplayer, so that you race like a human, and this is very positive.
Conclusion: For the 10€ I paid, it is definitely worth it and recommended. However, if I had paid 40-50€, I might have been a bit disappointed, as I expected more from Polyphony Digital