The MKI MR2 tends to be a very reliable car, given their age. They handle hard driving well, and the motor is very reliable even when driven at high RPMs regularly. Most parts are still readily available either direct from Toyota dealers or third-parties, and most DIY-ers find that the size of the engine bay does not make engine work any harder than the average front-engine car.
Of course there are common problem areas, and some things you should look out for when you buy the car.