I tried out the group calendar feature in SP2010 and it works pretty good. My only problem is that every time I load the page with the calendar view, it only adds my current user in the calendar. So I enter some users or group manually from the "Add Person" text box and it shows exactly what I would like to see by default. The problem is that I did not found any solution to save this in a view or in the default view.
As my goal is to share the team schedule, I would like be able to set a default list of persons or a group to my calendar view so the user don't have to add all of them manually. I think I am missing something because using a calendar group and displaying only your schedule makes no sense.