probably means the buggy part. i worked at microsoft and one note worked great on windows but was shit on my mac. it wouldn't even sync properly

There are lot of missing features too - See "Key OneNote Features from Windows Missing on Mac" http://www.makeuseof.com/tag/essential-guide-onenote-mac/

It was extremely slow and buggy on android. It wouldn't sync

This is part of [1] why I won't be getting another Macbook when work gives me a notebook, and go back to Windows instead. Our IT relies on a lot of Microsoft stuff (Office, Exchange, Skype for Business, etc.) and that works much better under Windows. 1

A notable feature that we're missing on Macs is recording in Skype for Business (aka Lync) meetings. We only have two Windows notebooks in our team of 20, so we have to rely on them joining every important meeting to capture a recording.

[1] Another part of the decision is WSL, which might enable me to abolish my work VM.

Have you used it lately? Works very well on my 10.11.x Mac... I also use a Asus Vivo note 8, and Samsung Galaxy Note 3 (my old work horse) and they all sync perfectly... at least now they do.