Haven 'works' in the way you might like it to, if you're canny.
We went on several Sun voucher (£9.50!!!!!!) deals beck when our DSs were in primary. Back when you could 'extend' a weekend without the truancy officer calling. 😂
A mixed bag.
I'd ALWAYS upgrade to a silver, myself.
Take earplugs. People will be crashing back to their vans, shouting, at all hours.
They vary, but the upshot is, it's Butlins, but not necessarily always in a bad way.
We've enjoyed the water parks (main attraction, go early before last night's parent-revellers have even crawled out of bed), and penny arcades. Kids' entertainment, early, is okay, before the 'ready for a night of it' parents pushing buggies, with exhausted babies within, arrive.
Use it as a base to explore further, dipping into the site stuff as you wish.
Watch your DC on the outdoor play equipment. There'll be kids there who've been taught aggression quite young (very much depends on which site), but I'm not joking. At those prices, there'll be a lot of different 'walks of life'.
Caravan parks are better than fixed villas as they can wheel the old and redundant away, and easily replace it.
Take cleaning equipment with you. Seriously.
Most of our Haven hols worked for us as a family. It depends what you're looking for.