Tricky question! To be honest, OKRs (Objectives & Key Results) are HIGHLY context- and business-specific, so there isn't such thing as "good OKRs for Product Marketing" in the abstract. You should be aligning PMM OKRs to the OKRs at the company level. And keep in mind that they are all about business transformation, not keeping the lights on. So they will involve stretch goals and should intersect and overlap with the OKRs of other teams across the org, not be strictly unique.
On the other hand, there are plenty of good KPIs (Key Performance Indicators) for PMM to track. For B2B and SaaS, my favorite PMM KPIs are:
- MQL-to-SAL conversion rate
- Sales win rate
- Contribution margin for newly targeted segments
- Adoption rate within the first 48 hours after launch
For B2C and marketplaces, my favorite PMM KPIs are:
- Adoption rate within the first 48 hours after launch
- User survey respondents' preference for your differentiated features
- Segment-specific retention rate