Emm, when you establish that a car is overrated, might you also provide what it is rated for.
For example, I agree the Evos are overrated. Many people think they are the best things since sliced bread, which isn't true and therefore overrated. And like faisal pointed out, it isn't the most involving car thanks to all those electronic gismos. BUT, crucially it isn't overrated when it comes to the way it performs, the amount of performance you get for your money and the way it makes ham fisted drivers look good.
Similarly, the AE86 is overrated thanks to all the hype from Initial D. Fanboys automatically think they'll turn into Takumi Fujiwara when they drive one. But it isn't overrated when it comes to its brilliant rear wheel drive chassis.
But you can generally say that these 2 cars are overrated for what they are. Doesn't mean they aren't good. Overrated simply means people take these cars for more than what they are.