The Italian electoral system is terrible.
Yes. Majority bonuses are a perversion of proportional representation. Either you use real PR or you use FPTP or whatever.
No, because proportional representation with majority prizes are aimed to provide clear majorities to a coalition whil not perverting the whole citizens' representation as FPTP does. FTPT is the dumbest electoral system, provides Assembly who aren't even closely representative of the share of the votes. Majority prizes allow to conciliate the need of governability with the exigence of democratic representation.
How is it fair
and real proportionality that a party with a plurality, say 30% of the votes, gets 50 flipping percent? That's as bad as FPTP.
How is it fair
and real proportionality that a party which has won an election with 30% of vote (and the other party wins 29.5%) gets a majority? FPTP is calling, they want their crap back.
Either you do PR or you don't do it (or at least you don't have the balls to blatantly lie and call it PR).