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Oh what fun this one is! Fuel, tires, and engine wear all factor into this one, so watch that fuel gauge or else you are going nowhere fast. Like GT3, GT4 offers a wide range of cars and tracks, each with their own little quirks. And the Endurance races return, only this time with a 24 hour endurance that is just as it's name says: 24 hours of racing. Have snacks and a diaper ready for this one. A new addition is B-Spec mode, where the computer drives your car for you, as aggressively as you tell it to. Makes those harder races just a bit less nerve racking, and being able to speed up time by 3 helps to, takes that 24 hour race and makes it a nice a leisurely 8 hour drive, complete with pit stops. But don't rely on B-Spec mode, it tends to make some mistakes on the narrow courses.
Unlike GT3, this time you can add a spoiler to a car for added downforce, and that tiny bit can mean the difference between winning and losing a race. Also, washing your car does more that look good, with the higher performance LM cars it help their handling at high speeds. Useful for fast tracks with gentle curves.
GT4 is still a hardcore racer, with the only cutscene being the ending movie after beating the Professional Hall GT Cup. But you're not done then! You still have the Extreme Hall and the manufacturer races to do. Add in the Endurance and Special Conditions and Driving Missions, and you have plenty to keep you occupied for quite a while, especially since winning some races takes a long time, with just as much patience.
Again, engine wear will decrease your car's performance after a while, but after a couple thousand miles you can do an engine rebuild to gain a majority of that power back. Also included is body warping, caused by those turns races are so fond of. Get enough warping and the car become almost undriveable. But there is a roll cage to help with stiffness, and a body refresher plan to combat the warping.

9/10 From me because the only real flaw I can find is the lack of damage modeling. Still get those bumps and bruises, but nothing you can see.

Silly Ty
It a racing game not GTA