Simple answer is, in real life, yes, an MR2 is MUCH harder to drift than an FR car because the wieght in in between the axles, meaning the car can pivot a lot more easily, meaning it rotates faster and therefore requires much faster inputs than an FR car. It alos suffers from turn inundersteer, which doesn't help, as you have to drive them super aggresively. Aggression, plus the snappy nature of MR cars, means that most people don't even try to drift MR cars because it usually ends in fail.
Don't get me wrong, they can be drited, but you have to be confident and the driving style is different to normal FR drift.