Hi Mc,
I have been to a few Haven parks when I was younger, my last will have been about 10 years ago. At the time they were quiet and peaceful, with good facilities and nice accommodation. We tended to stay in chalets rather than caravans, as my mum doesn't like caravans! But I do recall one or two caravan hols.
It just sounds a little like it hasn't changed or modernised since the last time I was there, which is a shame, because they are a great alternative to going abroad, especially if you have kids, and provide good value for money.