There are a range of standards is the impression I get - some, like the Home Counties, are the top level of cricket for a wide area and the standard is pretty decent. Others are, by reputation, a bit weaker - I know the Kent Premier has been reported on here as being a mixture of good teams and pretty average ones. Then you have strong ones that could be a lot stronger - Yorkshire and Lancashire are the obvious candidates here, where a lot of teams preferred to stick in the leagues they had always been in.