NZ switched from FPP to to MMP [0] after a few elections where a) the government was formed by a party that achieved <40% of the popular vote and b) parties that received 15 - 20% of the popular vote achieved only a tiny modicum of representation in Parliament.

I'm not sure MMP is the ultimate ideal, but I much prefer it to FPP. It's a very rare government that isn't a coalition government, and while we get the occasional tail wagging the dog moment, we also get a more diverse set of parties in power, and also more diverse representation.

Often what voters want to know before voting is who a party is willing to go into coalition with, there's usually no big surprises (e.g., the righter-wing ACT party and the centre-right (by NZ standards, they're still left of the Democrats at least when measured by public healthcare etc.) National always dance together, Labour and the Greens typically get along via a confidence and supply agreement even if the Greens are not formally in coalition) but then you have New Zealand First, who are openly mercenary about their choices, and the original Maori Party that went into coalition with National which doomed them in the next election.

[0]: https://en.wikipedia.org/wiki/Mixed-member_proportional_repr...