Wow... what a thread, just read the whole lot (bored at work).
I'm very interested in this as I live in Northampton, but I am astounded at the negativity. The only people who I could understand being negative about it, as they are just down the road, are the guys at Silverstonercmcc, but they are some of the most positive people in this thread.
I'd class myself as somewhere between a buggy-basher and a racer. I can see the appeal of a track with big jumps and long straights as much as the appeal of a tight, demanding track. I was disappointed to see the Silverstone buggy track had no big jumps when I went there, but still very much enjoyed racing round (till my car fell apart).
I can see myself going there [MA] for a fun drive with my kid, but going to Silverstone buggy club for a more challenging drive. Both have their place.
Is the outdoor track up to spec to hold the World's or Euro's? That would have made sense to me. As far as I've heard, there's nowhere in this country to hold it, and this could be the place to do it.
On the other hand, the tarmac tracks look great.
Kinda makes me want to get a TC now