OK the engine was not great, but if this one is running OK without a noisy / tapping top-end then it should not be automatically avoided if an interesting older car can be kept in use. If there are problems then yes... replacement parts are difficult to find and you don't want to waste money.
The engine was a good idea in theory, adding a modernised cylinder head to the old Tipo-type 1.4 SOHC engine, but in practice it was disappointing (but not disastrous). Fiat did the same thing with the Tipo / Tempra 1.6, giving it the 16V 'torque' head for the Brava / Bravo / Marea, and this version was successful right through the Multipla and Stilo models.