Belt squeals when the car has sat outside in the rain.
Interior plastic scratches easily.
Driving even at moderate speeds into sharp turns feels like car is going to roll over.
Non-standard stock radio/tape player makes it virtually impossible to replace with an aftermarket quality radio/player.
Speakers rattle interior trim even with bass set at negative number.
Seats are uncomforatable for long trips.
Road noise can be very high, especially with snow tires on dry pavement.
I've been rear-ended twice at very high speeds. Both collisions resulted in low cost damage and no personal injury.
Just for your information, the radio can be replaced with an aftermarket receiver. There are converters that make it possible to fill in the space that is left when the aftermarket receiver is put in. (I am assuming that the reason you couldn't get an aftermarket CD player is because the Tracker has the taller radio). Those "converters" are available online or at any car audio specialist.