I have an early 02 Wagon with 87k on it. My biggest complaint is the following:
-The clock doesn’t work anymore. Totally ruined the car for me.
As for the rest, mileage is around 22-26MPG depending how I drive. No real issues besides that. Find it enjoyable to drive, quite stealthy, most people call BS on WRX wagons existing. Makes for an excellent DD all-around insanely practical and reasonably fun. While being very inexpensive to maintain.