You're grossly misinformed
You're grossly misinformed and biased.
I've owned an Abarth 500 for three years, and the only issues I've had were a burned out light bulb in a the cruise control switch and a faulty TPM sensor (not made by Fiat). the turbo Multiair 4, which is the same as the one on the124 Spider is known to be a very overbuilt engine with no issues, and its stock internals take a lot of extra aftermarket horsepower. In a recent reliability test in the UK, the Fiat 500 was second only to the Toyota Yaris in reliability for cars in its class, and the Fiat Panda, on which the 500 is based is at the top of reliability surveys.
I'm afraid you're the only thing that hasn't change since the 70's.