All cars that get old have those parts that get worn, I had a Pontiac Fiero GT that had ball joint and bering issues, I don't make a blanket statement that because I owned an 88 all other GM products are the same even to this day. Whatever, my wife's 05 has 105 miles on the clock and runs awesome. Just like any maker, if you buy an entry level car (base model) most likely (A) they are going to have wear parts, (B), they were bought new by someone who did not do the correct maintenance on them because they didn't have cash, that's why they were in a base model. This is true for Toyota, GM, Ford, whatever. Spend a little more and you get what you pay for.
I've had 5 WRXs so I think I can speak for the post 2000 SUbarus. 02 and 03, only Issue we had with either was replace brakes once each before 50k miles. Both were totaled at 50k miles and neither my wife or my self were hurt in any way. No glass broke, doors opened just how they did the first day of ownership.
05 Wagon and 05 STi, Had the rear struts replaced under warranty at 30k on the STi, after that I broke a bunch of shit on it trying to put new clamps on the power steering hoses. The WRX wagon has never had a Dealer issue or a warranty claim, we did all the maintenance either at a dealer or myself. Next is a Timing belt (soon) and then maybe a clutch in the next 10K miles. 105k miles currently, stock clutch. Runs everyday haven't seen a bit of rust yet. 05 STi was totaled in a 9 car pile up on 207 at 65MPH I walked away without a mark on me, windshield cracked form airbag, no other glass broke, doors opened as they always did. Totaled at 90k miles.
My fifth is below and well 1700 miles, not a complaint yet.
My advise is if you buy a used Subaru good luck finding someone like ourselves that put the time and money into maintenance that will part with their vehicle. The ones that part with them (base models) is because guess what the maintenance is required now or they skipped it and it runs like shit now. So time to just buy another base model and abuse it. I have very rarely seen a nice used subaru, ours will most likely go to a family member who will abuse it and not take care of it until it dies. We already have my wife's spoken for from a family member who we already know will drive it into the ground.