I understood that's what you meant by PR, and Germany is just one example where PR has produced good, stable government. There is a majority government, just not a single-party one. Also, in Germany there's a 5% (?) threshold which constrains the number of parties, while in Italy you get a multiplicity of parties. There isn't just one type of PR.
Compare that with 37% of the popular vote producing a majority government. I've lived in a safe seat for 25 years and I don't believe my vote has ever counted. If you'd been here in 2015, you wouldn't have known there was an election going on. With such a democratic deficit, is it any wonder that people used the Brexit referendum to have their say?