Turbo cars take maintenance whether it's a MKIV, MKIII, Evo...
There is nothing wrong with the MKIII as a daily driver as long as you stay on top of it.
If you hear a noise, feel a vibration, notice a lack of power... check it out immediately.
Check the oil every time you stop for gas.
If you see a spot on the driveway, find the source of the leak.
....
Overall I've spent an average of 1-2 days a month working on the Supra in the 5 years I've had it. I'm at the point where most major components have been replaced (HG, Compressor, PS Rack, water pump...) and most of my time working on it now will be straight up maintenance or upgrading it.