I attended both days, so here are my 2 cents.
The new configuration is just too tight. Luckily, as far as I know, our large run group had no crashes in the tight stuff.
I know a lot of people were complaining about the slow speed corners, but I never had to use 2nd gear in my car. I have used it at times at Hallett's turn 2.
The curbing is quite high, so even if you tried to jump the curbing to make a pass, you're likely to damage something in the long run.
Lack of tires along the inside track wall.
Tire wear and the subsequent "other peoples rubber" getting picked up. I would say that I had about 5 decent laps before the grip went away and the vibrations started from all the buggers inside of my wheels. I know that they had the sweeper out as much as possible, so I know they are trying to keep it clean.
The high temperatures and Fathers day probably kept quite a few people home.