We recently had an election in my state and, because of the complex Hare-Clark system of proportional representation, it took two weeks to get a final result. However, the overall outcome was more or less clear on the night of the election. The conservative government was returned but, again, without a majority in its own right. It has needed to do deals with minor parties/independents to ensure confidence and supply.
That means that the government will not be able to bulldoze it's conservative/right-wing legislative agenda through the parliament. The Greens and the minor parties/independents will demand modifications to legislation to take account of their own environmental and social concerns. Otherwise legislation won't pass. And that's good. That's what the people wanted.
The legislature consists of members from the left of the political spectrum, members from the right and those in between. The system of proportional representation works. And parliamentary democracy still works smoothly, (if a bit more slowly) despite the complexity of the make up of the parliament.
So, I would say that proportional representation takes the hard edges of what might otherwise be a government drunk on its own power. It means we avoid the extremes of the hard-right or the hard-left, but we still get good, effective government.