Based on my experiences in many BETs, MSG was not great but not awful in terms of leg room.
The worst places I have been to are Kenan Stadium and the Fleet Center in Boston. It might be called something else now, but it is where the Celtics and Bruins play. Just brutal how little leg room they made available.
I know most Boston people are midgets, especially the handful of BC Superfans that still exist. But you have to plan for people from out of town when you build these places.
Does BC have a school of architecture? That could explain this.