DR George - I had a similar experience to you with Rent - I arrived a half hour early, only to be the first one to arrive. And in a theatre seating perhaps a few hundred people, there was a total audience of under 30 people.
The editing was a bit "busy, " but it did capture the theatrical experience pretty well. As I had never seen Rent live on Broadway, I was grateful for the experience, and the cast sang the score very well, I thought.