But it is a quirk that there have been times when almost half the voters voted for either left or centre left, almost half the voters voted for right or centre right, and then we wait around for weeks while Winston (who only got 6% or whatever) decides which half should get to govern.
Same principle as swing states I guess. It's just amusing that it's always the same specific person, especially given his personality.
The great thing about MMP is the proportionality often has a moderating effect. It annoys me when the left are in power (Winston won't let the Green Party get their way on some things) but it feels like a saving grace when the right wing are in power (Winston will also not let the neoliberal libertarians get their way on some things). So it's working as intended.