I haven't been on this forum for many months and threads like this are the reason. So maybe I shouldn't have returned, but I have to respond to the sheer lameness of this thread.
There are so many reasons for a piano to be bad that blaming the brand is stupid about 95% of the time. If a piano is out of tune should you blame the piano or the owner who doesn't bother to maintain their instrument? It's only when a piano will no longer hold a tuning that you can blame the instrument. Only the owner will know for sure. My piano hasn't been tuned in at least a year and a half, but it still sounds amazingly good. Still it's due for some maintenance soon (once heating season really kicks in).
Any piano in an academic setting (school of any type) has probably been badly maintained. Even music schools simply don't have the budget to keep all their instruments in top shape. Usually only the concert instrument gets regular attention, then the instruments in teacher studios, finally the practice instruments get the least maintenance.
Any less expensive piano has probably not received the dealer preparation that usually makes all the difference. That's how the dealers get you to spend more. It simply doesn't pay off to invest tech time in an instrument that won't bring in big bucks. However, if you buy a less expensive instrument and hire a tech to do the prep that should have been done, you can come away with a fine musical instrument.
Finally, it is useless to complain about any instrument that's more than 50 years old. Any instrument that old that hasn't been refurbished will be a dog. It's just the nature of the beast, even if it's never been played. Time affects the downbearing of the sound board (which will affect the efficiency of its ability to generate sound and dynamics) and dust gets into the action. Add in playing the thing and others things happen as well, the hammers and felts in the action get compressed, the tuning block wears out, the damper action develops problems. It doesn't take a lot going wrong for a piano to be perceived as a POS.
So next time you play an instrument that's a suboptimal experience keep some of this in mind. If a piano is out of tune, ask when was it last tuned? If it sound thuddy and klunky, ask how old it is? If the action is heavy or just hard to manage, ask when it was last regulated? Put the onus on the owner to explain why they're asking you to play on a crappy instrument. Acoustic pianos need maintenance and too often don't get it.