Crofty is a great circuit. It has fast flowing sections, as well as the tightest hairpin in the UK after the twisty complex. The track itself has different types of tarmac, some smooth, some bumpy, so it is a good workout for your car & technical in nature to get the best lap times.
Run off areas are not that huge, but there's a good gravel trap at Clervaux, the only place to be wary is at Barcroft, where badly set up ( or possibly driven, can I say that ?) rear engined cars can end up going backwards into the barrier. Control through Barcroft is more important for lap time than ultimate speed as Sunny follows shortly afterwards & can be taken very quickly, or as a bit of a handfull if entry is too fast.
Summary - Croft is a very rewarding circuit when you get to know it, that's part of the attraction. (unlike say BH which is very easy to learn)