Ooof! I'm surprised to read so much negativity on this game. My personal experience is much different.
It is my favorite Gran Turismo so far, and I see it as such an incredible modern game. The gameplay (physics, control) is fun as heck, especially with driving with all assists off and custom tuning all my favorite cars. The graphics and sound are incredible (I race in first person cam with music off in races). I don't prefer the focus on the circuit track style of some of the locales, but in general, I enjoy the majority of the tracks. Other aspects like the cars themselves and weather effects look incredible. There is tons of content for a player like myself - I've been hooked for enough hours thus far that the value of what I payed has been met, and I don't foresee myself becoming bored anytime soon.
Really, my only gripe about the game is the AI in the regular races. Rolling starts and playing catchup for the entirety of laps gets old. Out of all the games, I actually enjoy racing the AI in GT2 the most - It effectively used rubber banding in that every race was tight and had me on the edge of my seat. Sure, the technical flaws of using a method like rubber banding can be debated, but I just know in my experience I really enjoyed the intensity and "tightness" of that racing, rather than catchup or blowing past every other car and racing myself in first place.
But anyhow, I love Gran Turismo 7. It sits at the top with GT2 for myself. Reading through much of this topic, I'm glad I enjoy it so much - bummer to hear everyone has so many issues with it! Hopefully they do continually support it and update toward what ya'll expect out of it.