I agree with JackB , bevo & a lot of the comments made in this thread.
I am not disappointed with GT5P because I find it much better than the demo had suggested: the physics are much more convincing (I don't know why they didn't put a decent FR car in the demo), so the driving can be a real challenge now.
As other people have commented, the in-car view is amazing. The car modelling is amazing. The environments I find a bit flat & unattractive, like everything is super-lit. It would be really nice to have some more atmospheric lighting, as well as,of course, weather effects.
Love the cool jazz piano stylings.
I do wish there were a couple more tracks, although I'm OK with the number of cars.
The actual racing is, for the most part, the same old boring grind it was in GT4. I know that this is the established game-play structure for the GT series (& very similar for Forza), but for me it imposes a plodding progression on the player: you have to do stuff just to get it done. Re-running the same lap over & over again, with the same 15 cars, until you've figured out how to get the absolute perfect line around a track doesn't have much to do with good driving & is "difficult" in the wrong way.
The central problem remains the very limited AI, compounded by the poor collision physics & lack of damage. What makes racing interesting is variability & unpredictability. Without that, every race is just a "time trial with moving obstacles".
I love the game-play structure in F1:CE where you have a long term "career", where the point is to develop your driving skills, so that you can effectively compete in (long) races, where anything can & does happen, you actually interact with the other drivers & cars, & where terminal damage is always lurking around the next corner. It is, how can I put it, more... 💡
exciting!