Yup Paddock is right up there too - fabulous corner, and really tricky to get right. Last year I was racing against a 2001 Dallara and had it all crossed up on the entry in my attempts to get by him. I got him though, into Druids. Eventually he spun off in Paddock trying to keep up with me!!
He claims he wasn't happy with his seat, which might go some way to explain why a modern F3 car, at normal ride heights, with a more powerful F3 engine and a more experienced driver got trounced by a shit driver (me) in a shit car.
Cadwell is supposed to have a really good corner or two (though I can't remember the names), as is Oulton.
I don't like Rockingham, and it hasn't got what I'd call a 'great' corner. I'd imagine the old first chicane was pretty hairy, but I never used it.