The effectiveness of scrum really depends on the team size. The larger the team, the more bureaucracy is needed to manage it.
True. My last project started each day with 2 hours of scrum.
What? Was your 15-minute stand-up 2 hours long? If so, are you sure you were doing it right?
Were you scrum-master, and doing 2 hours of admin per day?
What were you doing for the rest of the working day?
I'm not really sure what you are describing here.