I played the game for a few hours and through all 10 Tour events in the game, so I think I can give a fair assessment now.
Pretty much concluded that this is the Killzone: Shadowfall of racing games. Ridiculously pretty, but ultimately lifeless. Style over substance.
My biggest complaint is the weather effects; they are WAY overdone and in your face. I get that they want to show off their tech, but design and aesthetic choices should never hinder game play. Even in third person mode, the whole screen is covered in haze and droplets, to the point where I cannot reliably see where I am going. This has led to many mistakes that could have been avoided. Even though I am quite experienced with racing games, it was quite difficult to even get in the top 5 position in the first few races because of this fact. I know many are gonna scream,"it's realism bro!", but it's not. It's fancy effects for the sake of effects. Simple rainfall should not feel like a hurricane. I have raced on tracks in real life in the rain and it is no where near as bad as this.
To prove the point, do you know what happened when I played my first race in dry, sunny conditions? I got first place and my time beat most of the people on my friends list.
Second complaint is the AI. After racing the drivatars in the past few Forza games, this feels like a huge step back. They never split up or make any mistakes. Just perfectly follow a line through every course, which makes them look more like a train than individually piloted cars.
Third complaint is the "dynamic difficulty" aka rubber banding. I know they say it's minimal, but I've noticed it on several occasions, one that totally took me out of the experience. I am lucky enough to have driven many of these sports and super cars in real life, so I know what they are capable of and how they should behave. I was going ~130mph and accelerating on a straightaway in a V12 Aston Zagato, when I was overtaken by a Caterham R500. Sorry, but in no universe is that possible.
There is just something off about the handling as well. There is not much of a middle ground between grip and losing control. In Forza, I can play with the cars at the limit and adjust them mid corner through throttle control and steering. This game does not provide that fine level of control and playfulness. The cars go from grip + understeer to violent snap oversteer in an instant. The lack of rewind feature is also quite disappointing. You can play amazing 90% of the race, but a single fuckup means having to start the whole even over while you get overtaken by the train of robots you fought so hard to get ahead of.
Lack of customization is a bummer too.
Overall, I just didn't have much fun and it's not just because of the difficulty. Bloodborne is my favorite game of the year, but when I fail in that, it is almost certainly because I made a mistake. In this game, it's either because I couldn't see where I was going, the car did not handle how I expected it to, or an AI rammed me off the road because I happened to be within it's prescribed racing line through a corner.
It's hard to put into words, but this game just doesn't have much personality or that "it" factor. I don't believe it will leave much of a legacy.