Really really good.
I take ds there now. It's about half an hour straight down the M6 from me.
£2.50 per car. Loads of little lakes each designated for different purposes: jet-skiing (he's a bit small.. but soon, very soon!), RC boats, a little lake for different type of fishing, recreational for duck feedings... all sorts.
really good little visitor centre with a decent cafe as well.
The kids play stuff is pretty good and there is an adventure play park for over 5's but it's shut down right now due to vandalism .
but yes, very very good and I would recommend it to anyone a bit outdoorsey.
So... junction 9 off the M6, follow signs for Kingsbury, you can't miss it. Someone else on here recommended this but I can't remember who.