Brilliant, I love the physics but the engine isn't important, the important thing is that you have fun, and enjoy yourself. This game does that, and more. I mean, drifting, on most games, is unrealistically easy. Sure, the easy way is fun, but I perfer the way that GRID does it. Quite hard and alot more rewarding.
Now, let me break this into # sections..
1) Physics/Engine
Absolutely amazing. Hit a piece of debri from another car and you'll find about 3 of your tires go POP just for driving over it. Smash into a wall and find half your car 2 metres away. Awesome replay system for if you die during a race or if you just want to take it again. Press enter, or if you died it's automatic, and press the right Function keys to rewind, fast forward, play, pause, start from there, change the camera and more.
2) Fun/Enjoyment
Sky high. I play this game like twice a day and never get bored of it. Skidding round corners in the most intense drifting battles ever made in a game, yeah, A LOT OF FUCKING FUN. Who doesn't enjoy slamming the fuck out of your competetor's car without a penalty, I mean, if he's doing perfect drifts and you're not so good, just go full force at him, kill him or wreck his car, and continue to drift away.
3) Value for the price
Honestly, it's fucking worth the £20/$40 to play this masterpiece. Just download steam and pop off to the store or buy a retail version and off you go. NOTE: If you're using steam, god hope you have a good internet, because you'll be downloading 12.5 GB of pure awesome racing material.
Thanks for reading, hope you like the game.
AcidSoldier
Also, that is an in-game screenshot that I took.