When you look back at footage of the early days of Supercross (when they actually started of by calling it stadium motocross) it was just that, a motocross track, albeit man-made, in a stadium. When Firko said he got caught up the the excitment of the early days, it was probably cause it was actually exciting.
And don't get me started on what has happened to touring car racing over here. Parity my arse.