In my humble opinion, it's really really amazing, BUT it has its share of little problems. So not everybody is a big fan of the game like me.
Racing is by far my favorite genre, I've played A LOT of stuff, and Grid Autosport gives the player something that not many racing games managed to achieve: the thrill of racing. Sure, other games may have better graphics and some other fancy stuff, but when it comes to the racing itself, really, no other game from the ones I've played comes even close! I see people saying this about Project Cars, but honestly, it's not even close, really! And it all comes down to the fantastic AI this game has. It's a game that makes you sweat, for real.
It is structured kind of like Project Cars. You don't buy/earn/own cars; you receive offers to race for one of the 8 teams in the game. There are five different classes: touring, endurance, open wheel, tuning and street. In some classes, one team might be good, and in other classes, it might suck, which means that a car from a better team will be faster, specially because if offers more adjustment options. The better you go, the more interest in you the bigger teams will have. Ravenwest is the best team on every class, so when you're in a weak team, it will be impossible to beat them, and even some other guys. This isn't a game that will force or request you to win every damn race. In fact, most of the time you won't, and that's fine!
It offers you the option to do 10 minutes of free practices before every race, and even qualifyings. It won't simply throw you in a track you don't know and expect you to do well like Forza, for example, does.
The game offers a good range of different types of cars, from street cars to LMP1 prototypes and Indycars. It's a return to the old Toca formula, but not as hugely rich as it used to be. But there's enough of content there to last more than a hundred hours like I did.
Gameplay wise, it's kind of awkward. It sits between arcade and simulation. It's more simmey than Grid 1 and 2, but it's still not there as a light sim as (again) Forza. Feels kind of loose, but it's not as bad as Shift 1 and 2, don't worry. You can get used to it, and even if the handling betrays you, you can always hit the rewind button.
Another problem (well, not for me because I use the dash cam anyway) is the lack of detailed interiors. You probably remember that they cut out the internal cameras in Grid 2. People didn't liked, so they brought 'em back to Grid Autosport, but without giving themselves the work of modelling them properly, lol. Oh, and the car liveries usually suck. You can download some
amazing mods here.
I see Grid Autosport and Dirt Rally (another FANTASTIC Codemasters game [even better than Grid, IMO) as some kind of tests. They both have very simple menus, you see that there's not a huge amount of money thrown into them. Not super fancy games, it doesn't try to impress you with cheap gimmics, but in my opinion, these two are the best games Codemasters released in the last 10 years.
