For small businesses or personal use, it works out well. The whole idea of a free platform on a free service is very alluring, especially if you don't have high end or high tech services for such a program already. Calendar would work in most business, school, and personal situations to keep track of where you're headed.
Makes it easy to schedule meetings and block off time
I can see everyone in my org's calendar's as well which makes it convenient when scheduling calls with multiple people so I can see when they have overlapping availabilities.
Integration with Zoom and Microsoft Teams for video calls that can be added from the calendar invite itself
Being able to group a team much easier so I don't have to add the same people over and over again without having to have access right to create a Google group
Room or space management, because of repeating events the rooms of the office tend to be always "occupied" but not everyone is there due to how the new hybrid way of working is
Better way of working together in the calendar events where it's easier for the team to prepare if I give a clearer better UI of all the documents/presentations they might need to look over
It's a bit outdated on how things should be working, the UI per say hasn't changed much and I believe there is still a lot more room for improvement in how the calendar shows, the creating process, the parameters on setting up an event and it could be better integrated with the g-suite and other tools
Google Calendar is a close competitor and I think wins in certain categories like general appearance and enabling focus hours & working hours. However, Microsft 365's calendar just seems like it has been built out more with a focus on business use case (despite still having many grievances with Microsoft 365).