I would agree. Most of the sites that we've liked have been independent sites, though we have just got back from a lovely break at a C & CC certificated site. We are both retired, with two dogs, and a desire to go for long walks, so we are reluctant to book ahead unless the weather forecast is good. Our ideal, during the summer months, is a grass pitch, at a small, quiet site, with nothing beyond the most basic facilities.
My pet hate, is a large, hardstanding, only, site, with "all the facilities", that just resembles a gravel car park.