I agree about the rule changes, but the change to 1000 four cylinders, unrestricted seem to level the playing field a bit, then the twins become 1200's. I dunno, but it's still very cool racing.
Is the difference in performance not really the ability to gain traction out of corners, and carry corner speed better, I've been a big twin man for a long time, and not ridden a 1000 4 cylinder in anger, but watching the racing the 4's look put of shape a lot more than the twins, almost as if they are difficult to ride hard, and lose grip easier.