I find the detail of this Wikipedia page to be amazing. It was shared 2 months ago (thanks @SamC). The main things that have changed since then are a continued slight dip in Labour/National and a slight rise in Maori/ACT.
If you have the time and energy then remember to read the policy proposals by the parties that you don’t like as well as the parties that you do like.
I think you would see more compromise, but the truth is that happens already - so instead of the compromise being adopting some of Act’s most extreme positions (anathema to me) or vice versa with the Green’s (something many farmers might rage against) the compromises would be to not go too far, not do too much.
In a way it would see the sort of change that Jacinda Ardern favoured - slow and steady, take the people with you rather than the sort of change that David Seymour would champion which is more I have the power right now so all this is happening right now.
For a lot of people that sort of stability would be beneficial - but for others, including people who need change most, it would happen far slower than it might now. So its really whether you want rapid change that swings from side to side until it stabilises into an electoral compromise over several elections, or one election and more minor change over a single term.